Hello,
Same problem here with the brand new Archer C5400 v2.0.
At first I always lost WAN connection from +/- 22h00 until +/- 6h00. All the LAN and WIFI connections stayed ok, just no internet.
Checking everything in the settings, I saw that the NTP-servers were not putting the time correct. I fixed this by replacing them with IP-addresses.
However the WAN-disconnections stayed the same.
There were no QOS or parental controls configured...
I refitted all cables between the ISP modem. Strangely enough the problem got better: only a few disconnects from WAN. So maybe it was the ISP?
I removed the Archer from the network and put my old D-link back in place: problem solved.
I have put my Archer now back and again I see the disconnects.
Here is the log: (btw the date's are wrong again because I did a factory reset and the NTP-servers have again sync issues)
Hardware Version: ArcherC5400 v2.0
Software Version: 1.2.2 Build 20170912 rel.56240
2017-09-17 23:28:20 led-controller[1097]: <3> 288753 Config importing failed
2017-09-17 23:28:20 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-17 23:28:20 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-17 23:28:20 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:28:20 led-controller[1097]: <6> 288051 Start to run WAN1_ON
2017-09-17 23:28:20 led-controller[1097]: <7> 288004 WAN1_ON is found
2017-09-17 23:28:20 led-controller[1097]: <7> 288003 Led rule name is WAN1_ON
2017-09-17 23:28:20 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:28:20 led-controller[1097]: <6> 288051 Start to run WAN0_OFF
2017-09-17 23:28:20 led-controller[1097]: <7> 288004 WAN0_OFF is found
2017-09-17 23:28:20 led-controller[1097]: <7> 288003 Led rule name is WAN0_OFF
2017-09-17 23:28:20 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:28:20 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-17 23:28:20 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-17 23:28:20 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-17 23:28:20 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:27:54 led-controller[1097]: <3> 288753 Config importing failed
2017-09-17 23:27:54 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-17 23:27:54 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-17 23:27:54 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:27:54 led-controller[1097]: <6> 288051 Start to run WAN1_OFF
2017-09-17 23:27:54 led-controller[1097]: <7> 288004 WAN1_OFF is found
2017-09-17 23:27:54 led-controller[1097]: <7> 288003 Led rule name is WAN1_OFF
2017-09-17 23:27:54 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:27:54 led-controller[1097]: <6> 288051 Start to run WAN0_ON
2017-09-17 23:27:54 led-controller[1097]: <7> 288004 WAN0_ON is found
2017-09-17 23:27:54 led-controller[1097]: <7> 288003 Led rule name is WAN0_ON
2017-09-17 23:27:54 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-17 23:27:54 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-17 23:27:54 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-17 23:27:54 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-17 23:27:54 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:51 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 16:14:51 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 16:14:51 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 16:14:51 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:51 led-controller[1097]: <6> 288051 Start to run WAN1_ON
2017-09-16 16:14:51 led-controller[1097]: <7> 288004 WAN1_ON is found
2017-09-16 16:14:51 led-controller[1097]: <7> 288003 Led rule name is WAN1_ON
2017-09-16 16:14:51 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:51 led-controller[1097]: <6> 288051 Start to run WAN0_OFF
2017-09-16 16:14:51 led-controller[1097]: <7> 288004 WAN0_OFF is found
2017-09-16 16:14:51 led-controller[1097]: <7> 288003 Led rule name is WAN0_OFF
2017-09-16 16:14:51 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:51 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 16:14:51 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 16:14:51 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 16:14:51 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:40 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 16:14:40 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 16:14:40 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 16:14:40 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:40 led-controller[1097]: <6> 288051 Start to run WAN1_OFF
2017-09-16 16:14:40 led-controller[1097]: <7> 288004 WAN1_OFF is found
2017-09-16 16:14:40 led-controller[1097]: <7> 288003 Led rule name is WAN1_OFF
2017-09-16 16:14:40 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:40 led-controller[1097]: <6> 288051 Start to run WAN0_ON
2017-09-16 16:14:40 led-controller[1097]: <7> 288004 WAN0_ON is found
2017-09-16 16:14:40 led-controller[1097]: <7> 288003 Led rule name is WAN0_ON
2017-09-16 16:14:40 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 16:14:40 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 16:14:40 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 16:14:40 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 16:14:40 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:17:06 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 15:17:06 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 15:17:06 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 15:17:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:17:06 led-controller[1097]: <6> 288051 Start to run WAN1_ON
2017-09-16 15:17:06 led-controller[1097]: <7> 288004 WAN1_ON is found
2017-09-16 15:17:06 led-controller[1097]: <7> 288003 Led rule name is WAN1_ON
2017-09-16 15:17:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:17:06 led-controller[1097]: <6> 288051 Start to run WAN0_OFF
2017-09-16 15:17:06 led-controller[1097]: <7> 288004 WAN0_OFF is found
2017-09-16 15:17:06 led-controller[1097]: <7> 288003 Led rule name is WAN0_OFF
2017-09-16 15:17:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:17:06 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 15:17:06 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 15:17:06 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 15:17:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:16:55 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 15:16:55 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 15:16:55 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 15:16:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:16:55 led-controller[1097]: <6> 288051 Start to run WAN1_OFF
2017-09-16 15:16:55 led-controller[1097]: <7> 288004 WAN1_OFF is found
2017-09-16 15:16:55 led-controller[1097]: <7> 288003 Led rule name is WAN1_OFF
2017-09-16 15:16:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:16:55 led-controller[1097]: <6> 288051 Start to run WAN0_ON
2017-09-16 15:16:55 led-controller[1097]: <7> 288004 WAN0_ON is found
2017-09-16 15:16:55 led-controller[1097]: <7> 288003 Led rule name is WAN0_ON
2017-09-16 15:16:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 15:16:55 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 15:16:55 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 15:16:55 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 15:16:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:54:06 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 14:54:06 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 14:54:06 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 14:54:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:54:06 led-controller[1097]: <6> 288051 Start to run WAN1_ON
2017-09-16 14:54:06 led-controller[1097]: <7> 288004 WAN1_ON is found
2017-09-16 14:54:06 led-controller[1097]: <7> 288003 Led rule name is WAN1_ON
2017-09-16 14:54:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:54:06 led-controller[1097]: <6> 288051 Start to run WAN0_OFF
2017-09-16 14:54:06 led-controller[1097]: <7> 288004 WAN0_OFF is found
2017-09-16 14:54:06 led-controller[1097]: <7> 288003 Led rule name is WAN0_OFF
2017-09-16 14:54:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:54:06 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 14:54:06 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 14:54:06 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 14:54:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:53:55 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 14:53:55 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 14:53:55 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 14:53:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:53:55 led-controller[1097]: <6> 288051 Start to run WAN1_OFF
2017-09-16 14:53:55 led-controller[1097]: <7> 288004 WAN1_OFF is found
2017-09-16 14:53:55 led-controller[1097]: <7> 288003 Led rule name is WAN1_OFF
2017-09-16 14:53:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:53:55 led-controller[1097]: <6> 288051 Start to run WAN0_ON
2017-09-16 14:53:55 led-controller[1097]: <7> 288004 WAN0_ON is found
2017-09-16 14:53:55 led-controller[1097]: <7> 288003 Led rule name is WAN0_ON
2017-09-16 14:53:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:53:55 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 14:53:55 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 14:53:55 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 14:53:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:26:06 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 14:26:06 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 14:26:06 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 14:26:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:26:06 led-controller[1097]: <6> 288051 Start to run WAN1_ON
2017-09-16 14:26:06 led-controller[1097]: <7> 288004 WAN1_ON is found
2017-09-16 14:26:06 led-controller[1097]: <7> 288003 Led rule name is WAN1_ON
2017-09-16 14:26:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:26:06 led-controller[1097]: <6> 288051 Start to run WAN0_OFF
2017-09-16 14:26:06 led-controller[1097]: <7> 288004 WAN0_OFF is found
2017-09-16 14:26:06 led-controller[1097]: <7> 288003 Led rule name is WAN0_OFF
2017-09-16 14:26:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:26:06 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 14:26:06 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 14:26:06 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 14:26:06 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:25:55 led-controller[1097]: <3> 288753 Config importing failed
2017-09-16 14:25:55 led-controller[1097]: <7> 288009 Failed to read WAN_ON
2017-09-16 14:25:55 led-controller[1097]: <7> 288003 Led rule name is WAN_ON
2017-09-16 14:25:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:25:55 led-controller[1097]: <6> 288051 Start to run WAN1_OFF
2017-09-16 14:25:55 led-controller[1097]: <7> 288004 WAN1_OFF is found
2017-09-16 14:25:55 led-controller[1097]: <7> 288003 Led rule name is WAN1_OFF
2017-09-16 14:25:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:25:55 led-controller[1097]: <6> 288051 Start to run WAN0_ON
2017-09-16 14:25:55 led-controller[1097]: <7> 288004 WAN0_ON is found
2017-09-16 14:25:55 led-controller[1097]: <7> 288003 Led rule name is WAN0_ON
2017-09-16 14:25:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-16 14:25:55 led-controller[1097]: <6> 288051 Start to run LAN_ON
2017-09-16 14:25:55 led-controller[1097]: <7> 288004 LAN_ON is found
2017-09-16 14:25:55 led-controller[1097]: <7> 288003 Led rule name is LAN_ON
2017-09-16 14:25:55 led-controller[1097]: <7> 288001 Receive data length = 132
2017-09-14 14:42:01 led-controller[1097]: <3> 288753 Config importing failed
2017-09-14 14:41:52 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 14:18:31 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 14:18:20 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:46:30 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:45:34 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:45:33 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:01:29 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:00:45 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:00:44 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:00:33 led-controller[1097]: <3> 288753 Config importing failed
2017-09-12 00:00:32 led-controller[1097]: <3> 288753 Config importing failed
2017-09-14 22:44:43 led-controller[1096]: <3> 288753 Config importing failed
2017-09-14 18:28:28 led-controller[1096]: <3> 288753 Config importing failed
2017-09-14 18:28:19 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:56:31 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:56:15 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:12:39 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:10:15 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:10:07 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:09:27 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:09:16 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 23:09:05 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:46:30 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:45:34 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:45:33 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:01:29 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:00:47 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:00:46 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:00:32 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:00:31 led-controller[1096]: <3> 288753 Config importing failed
2017-09-12 00:01:24 led-controller[1240]: <3> 288753 Config importing failed
2017-09-12 00:01:04 led-controller[1240]: <3> 288753 Config importing failed
2017-09-12 00:01:02 led-controller[1240]: <3> 288753 Config importing failed
2017-09-12 00:00:56 led-controller[1240]: <3> 288753 Config importing failed
2017-09-12 00:00:34 led-controller[1240]: <3> 288753 Config importing failed
2017-09-12 00:00:24 led-controller[1240]: <3> 288753 Config importing failed
2017-09-12 00:00:24 led-controller[1240]: <3> 288753 Config importing failed