As I said, the router keeps disconnecting for a minute or two. I have updated my firmware to the latest version too. I have managed to isolate the system log of the occurrence on two separate occasions, but I am not technically adept enough to understand it. I will paste both the logs here. If someone can help me diagnose the problem, I will be grateful. 

I have erased my IP, Mac address and username for privacy reasons.

System Log:-

####################################################################
#                    Archer C6 System Log
# Time = 2022-12-04 15:53:59
# H-Ver = 3.20 ; S-Ver = 1.0.14 Build 20211118 rel.43110
# LAN: 
# WAN: 
# Clients connected: 4 ; WI-FI : 4 
####################################################################

######### 2nd time issue #########

2022-12-04 15:53:02 led-controller[764]: <6> 288051 Start to run WAN1_ON
2022-12-04 15:53:02 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:53:02 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:52:51 upnp[4745]: <6> 217504 Service start
2022-12-04 15:52:51 upnp[4745]: <6> 217505 Service stop
2022-12-04 15:52:48 remote-management[4318]: <6> 282505 Service stop
2022-12-04 15:52:46 nat[3901]: <6> 211501 Initialization succeeded
2022-12-04 15:52:45 nat[3901]: <6> 211501 Initialization succeeded
2022-12-04 15:52:44 ppp[3054]: <6> 261091 ppp receive IPCP ACK
2022-12-04 15:52:44 ppp[3054]: <6> 261090 ppp send IPCP Req options
2022-12-04 15:52:44 ppp[3054]: <6> 261093 ppp receive IPCP NAK options
2022-12-04 15:52:44 ppp[3054]: <6> 261090 ppp send IPCP Req options
2022-12-04 15:52:44 ppp[3054]: <6> 261075 ppp receive PAP AuthAck Authentication success,Welcome!
2022-12-04 15:52:44 ppp[3054]: <6> 261074 ppp send PAP AuthReq user=
2022-12-04 15:52:44 ppp[3054]: <6> 261060 ppp send LCP ACK
2022-12-04 15:52:44 ppp[3054]: <6> 261058 ppp receive LCP Request options(mru=1492;authtype=PPP_PAP;magic=0x8b668ad0;)
2022-12-04 15:52:41 ppp[3054]: <6> 261064 ppp receive LCP ACK
2022-12-04 15:52:41 ppp[3054]: <6> 261061 ppp send LCP Request options(mru=1480;magic=0x8b09411d;)
2022-12-04 15:52:41 ppp[3054]: <6> 261025 pppoe receive PADS sess-id(15177)
2022-12-04 15:52:41 ppp[3054]: <6> 261024 pppoe send PADR Host-Uniq(bee)
2022-12-04 15:52:38 remote-management[3372]: <6> 282505 Service stop
2022-12-04 15:52:37 nat[3016]: <6> 211501 Initialization succeeded
2022-12-04 15:52:37 nat[3016]: <6> 211501 Initialization succeeded
2022-12-04 15:52:36 ppp[3054]: <6> 261024 pppoe send PADR Host-Uniq(bee)
2022-12-04 15:52:36 ppp[3054]: <6> 261022 pppoe receive PADO form AC-MAC(cc:b1:82:96:e6:59)
2022-12-04 15:52:36 ppp[3054]: <6> 261023 pppoe receive PADO AC-Name(PUN-HWI-X8A-BRAS-YOUBB-01)
2022-12-04 15:52:36 ppp[3054]: <6> 261021 pppoe send PADI Host-Uniq(bee)
2022-12-04 15:52:36 ppp[3054]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:52:35 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:52:35 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:52:35 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:52:25 nat[2358]: <6> 211501 Initialization succeeded
2022-12-04 15:52:25 nat[2358]: <6> 211501 Initialization succeeded
2022-12-04 15:52:23 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:52:23 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:52:23 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:52:18 ppp[1773]: <6> 261021 pppoe send PADI Host-Uniq(6ed)
2022-12-04 15:52:18 ppp[1773]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:52:08 ppp[1773]: <6> 261021 pppoe send PADI Host-Uniq(6ed)
2022-12-04 15:52:08 ppp[1773]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:52:03 ppp[1773]: <6> 261021 pppoe send PADI Host-Uniq(6ed)
2022-12-04 15:52:03 ppp[1773]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:52:02 nat[1253]: <6> 211501 Initialization succeeded
2022-12-04 15:52:01 remote-management[1439]: <6> 282505 Service stop
2022-12-04 15:52:01 nat[1253]: <6> 211501 Initialization succeeded
2022-12-04 15:51:56 ppp[333]: <6> 261021 pppoe send PADI Host-Uniq(14d)
2022-12-04 15:51:56 ppp[333]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:51:56 nat[706]: <6> 211501 Initialization succeeded
2022-12-04 15:51:56 nat[706]: <6> 211501 Initialization succeeded
2022-12-04 15:51:55 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:51:55 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:51:55 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:51:52 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:51:52 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:51:52 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:51:51 ppp[333]: <6> 261021 pppoe send PADI Host-Uniq(14d)
2022-12-04 15:51:51 ppp[333]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:51:51 nat[32339]: <6> 211501 Initialization succeeded
2022-12-04 15:51:50 remote-management[32505]: <6> 282505 Service stop
2022-12-04 15:51:50 nat[32339]: <6> 211501 Initialization succeeded
2022-12-04 15:51:46 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:51:46 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:51:46 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:51:45 nat[31784]: <6> 211501 Initialization succeeded
2022-12-04 15:51:45 nat[31784]: <6> 211501 Initialization succeeded
2022-12-04 15:51:44 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:51:44 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:51:44 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:51:40 ppp[30489]: <6> 261021 pppoe send PADI Host-Uniq(7719)
2022-12-04 15:51:40 ppp[30489]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:51:31 remote-management[31194]: <6> 282505 Service stop
2022-12-04 15:51:30 nat[30794]: <6> 211501 Initialization succeeded
2022-12-04 15:51:30 ppp[30489]: <6> 261021 pppoe send PADI Host-Uniq(7719)
2022-12-04 15:51:30 ppp[30489]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:51:30 nat[30794]: <6> 211501 Initialization succeeded
2022-12-04 15:51:25 ppp[30489]: <6> 261021 pppoe send PADI Host-Uniq(7719)
2022-12-04 15:51:25 ppp[30489]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:51:24 nat[30068]: <6> 211501 Initialization succeeded
2022-12-04 15:51:24 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:51:24 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:51:24 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:51:24 nat[30068]: <6> 211501 Initialization succeeded
2022-12-04 15:51:22 ppp[20738]: <6> 261026 pppoe send PADT due to(phase disconnect device)
2022-12-04 15:51:22 ppp[20738]: <6> 261066 ppp send LCP TermReq due to User request
2022-12-04 15:51:22 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:51:22 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:51:22 led-controller[764]: <6> 288051 Start to run LAN_OFF

######### 1st time issue #########

2022-12-04 15:42:17 led-controller[764]: <6> 288051 Start to run WAN1_ON
2022-12-04 15:42:17 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:42:17 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:42:07 upnp[22329]: <6> 217504 Service start
2022-12-04 15:42:07 upnp[22329]: <6> 217505 Service stop
2022-12-04 15:42:05 remote-management[21858]: <6> 282505 Service stop
2022-12-04 15:42:02 nat[21147]: <6> 211501 Initialization succeeded
2022-12-04 15:42:01 nat[21147]: <6> 211501 Initialization succeeded
2022-12-04 15:42:00 ppp[20738]: <6> 261091 ppp receive IPCP ACK
2022-12-04 15:42:00 ppp[20738]: <6> 261090 ppp send IPCP Req options
2022-12-04 15:42:00 ppp[20738]: <6> 261093 ppp receive IPCP NAK options
2022-12-04 15:42:00 ppp[20738]: <6> 261090 ppp send IPCP Req options
2022-12-04 15:42:00 ppp[20738]: <6> 261075 ppp receive PAP AuthAck Authentication success,Welcome!
2022-12-04 15:42:00 ppp[20738]: <6> 261074 ppp send PAP AuthReq user=
2022-12-04 15:41:59 ppp[20738]: <6> 261060 ppp send LCP ACK
2022-12-04 15:41:59 ppp[20738]: <6> 261058 ppp receive LCP Request options(mru=1492;authtype=PPP_PAP;magic=0x9d3496e0;)
2022-12-04 15:41:57 ppp[20738]: <6> 261064 ppp receive LCP ACK
2022-12-04 15:41:57 ppp[20738]: <6> 261061 ppp send LCP Request options(mru=1480;magic=0xe45b6fff;)
2022-12-04 15:41:57 ppp[20738]: <6> 261025 pppoe receive PADS sess-id(25138)
2022-12-04 15:41:57 ppp[20738]: <6> 261024 pppoe send PADR Host-Uniq(5102)
2022-12-04 15:41:57 ppp[20738]: <6> 261022 pppoe receive PADO form AC-MAC(cc:b1:82:96:e6:59)
2022-12-04 15:41:57 ppp[20738]: <6> 261023 pppoe receive PADO AC-Name(PUN-HWI-X8A-BRAS-YOUBB-01)
2022-12-04 15:41:57 ppp[20738]: <6> 261021 pppoe send PADI Host-Uniq(5102)
2022-12-04 15:41:57 ppp[20738]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:41:57 nat[20334]: <6> 211501 Initialization succeeded
2022-12-04 15:41:56 remote-management[20518]: <6> 282505 Service stop
2022-12-04 15:41:56 nat[20334]: <6> 211501 Initialization succeeded
2022-12-04 15:41:54 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:41:54 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:41:54 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:41:48 nat[19752]: <6> 211501 Initialization succeeded
2022-12-04 15:41:48 nat[19752]: <6> 211501 Initialization succeeded
2022-12-04 15:41:47 ppp[19653]: <6> 261021 pppoe send PADI Host-Uniq(4cc5)
2022-12-04 15:41:47 ppp[19653]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:41:46 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:41:46 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:41:46 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:41:42 ppp[19653]: <6> 261021 pppoe send PADI Host-Uniq(4cc5)
2022-12-04 15:41:42 ppp[19653]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:41:31 ppp[18184]: <6> 261021 pppoe send PADI Host-Uniq(4708)
2022-12-04 15:41:31 ppp[18184]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:41:24 remote-management[19014]: <6> 282505 Service stop
2022-12-04 15:41:24 nat[18689]: <6> 211501 Initialization succeeded
2022-12-04 15:41:23 nat[18689]: <6> 211501 Initialization succeeded
2022-12-04 15:41:21 ppp[18184]: <6> 261021 pppoe send PADI Host-Uniq(4708)
2022-12-04 15:41:21 ppp[18184]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:41:18 nat[18141]: <6> 211501 Initialization succeeded
2022-12-04 15:41:18 nat[18141]: <6> 211501 Initialization succeeded
2022-12-04 15:41:16 ppp[18184]: <6> 261021 pppoe send PADI Host-Uniq(4708)
2022-12-04 15:41:16 ppp[18184]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:41:16 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:41:16 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:41:16 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:41:13 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:41:13 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:41:13 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:41:13 remote-management[17646]: <6> 282505 Service stop
2022-12-04 15:41:13 nat[17294]: <6> 211501 Initialization succeeded
2022-12-04 15:41:12 nat[17294]: <6> 211501 Initialization succeeded
2022-12-04 15:41:07 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:41:07 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:41:07 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:41:07 nat[16722]: <6> 211501 Initialization succeeded
2022-12-04 15:41:07 nat[16722]: <6> 211501 Initialization succeeded
2022-12-04 15:41:05 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:41:05 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:41:05 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:41:02 ppp[15378]: <6> 261021 pppoe send PADI Host-Uniq(3c12)
2022-12-04 15:41:02 ppp[15378]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:40:52 nat[15665]: <6> 211501 Initialization succeeded
2022-12-04 15:40:52 ppp[15378]: <6> 261021 pppoe send PADI Host-Uniq(3c12)
2022-12-04 15:40:52 ppp[15378]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:40:52 remote-management[15875]: <6> 282505 Service stop
2022-12-04 15:40:51 nat[15665]: <6> 211501 Initialization succeeded
2022-12-04 15:40:48 led-controller[764]: <6> 288051 Start to run WAN1_ON
2022-12-04 15:40:48 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:40:48 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:40:47 ppp[15378]: <6> 261021 pppoe send PADI Host-Uniq(3c12)
2022-12-04 15:40:47 ppp[15378]: <6> 261026 pppoe send PADT due to(resending PADI)
2022-12-04 15:40:47 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:40:47 led-controller[764]: <6> 288051 Start to run WAN0_ON
2022-12-04 15:40:47 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:40:46 nat[14939]: <6> 211501 Initialization succeeded
2022-12-04 15:40:46 nat[14939]: <6> 211501 Initialization succeeded
2022-12-04 15:40:45 led-controller[764]: <6> 288051 Start to run WAN1_OFF
2022-12-04 15:40:45 led-controller[764]: <6> 288051 Start to run WAN0_OFF
2022-12-04 15:40:45 led-controller[764]: <6> 288051 Start to run LAN_OFF
2022-12-04 15:40:44 ppp[5023]: <6> 261026 pppoe send PADT due to(phase disconnect device)
2022-12-04 15:40:44 ppp[5023]: <6> 261066 ppp send LCP TermReq due to User request

######################################################