Hello, TP-link community! 

Just spent the last 2 days scrolling through great tips for fixing some of the home network issues, but unfortunately still didn't find the one I'm looking for. :(

I got my AX10 router about two weeks ago and for a few days, everything was running smoothly. Until the last week. My internet runs smoothly most of the day, no issues at all, but then in the evening the internet drops at the exact same time range (between 11pm 11.30pm) for about 5 minutes, then connects back again. This happens for 5 days straight now, really making the home office situation difficult. 

I'm wondering whether it's an IPS issue or router issue and looking for help to test out a few potential fixes until I ask for a replacement/return the device (which is something I don't want to do..)
 

Attaching a description of the situation and a few points (fixes I tried for the past few days).

Setup

I have an IPS-provided modem/router (Vodafone Station) which is connected into a wall via coaxial cable. I have reset the device into factory settings and followed the quick guide provided by ISP to turn the device on and do the basic setup (basically just create admin login/pw and turn on wifi). Since I don't want to run wifi on this modem/router, I have disabled it. Reason being that I only want to run wifi on my AX10. The ISP-provided Vodafone Station does not have any special settings turned on and I have not even done any manual changes (the interface is quite limited, and even if I wanted, I couldn't do much besides turning wifi/on of).

Then I have followed the basic setup from TP link to turned the AX10 on, done the basic setup (create admin login/pw), and connected the internet. I have used default settings provided in the quick guide, so DynamicIP, turn on DHCP, and turn on both 2.4GHz and 5GHz wifi. Then I have manually changed the IP address in LAN settings to 192.168.2.1 so I can access both the ISP-provided router (running on 192.168.0.1) and AX10, and that was it. Leaving any potential settings such as QoS, etc. to set up later. 

Using the ethernet cable, I have connected my AX10 with the Vodafone Station into the WAN port and after a few seconds, the connection was established successfully, and I could happily run my internet for a few days until the issues came.

Issue

Every day between 11pm and 11:30pm the internet drops (while both WiFis are still running), the internet LED turns orange, and after a few minutes, the internet gets back on. LED back to green. All normal. Unfortunately, this turns out to be pretty annoying since it repeats every single night, disconnecting all of our devices on a network. I've tried searching this forum for a couple of days for potential clues, tried some of those, but the problem still repeats every night. 

What I tired (and didn't solve the issue)

- Resetting to factory settings on both devices

- Rebooting multiple times a day to prevent the issue

- Checked parental control, auto reboots, auto reconnects, or similar settings that could be turned on by default out of the box

- Tired to turn off DHCL on the AX10 (secondary router basically), but then the internet doesn't work at all

- Tried turning on QoS for all devices on the network to prevent disconnection

- Tried connecting via ethernet when the problem occurs, the internet runs normally when connected into ISP-provided router (issue might be between AX10 and ISP-provided router then?)

- Tried disabling NAT on the AX10

- Tried firmware to update both automatic and manually (the manual does not allow me to upload a file, just returns "update failed" message)

- Tried changing the physical location of the modem

- Switched ethernet cables 

- Tried turning off the firewall on the AX10 (since there is one firewall already running on the ISP-provided router/modem)

- Tried to manually change secondary DNS to Google (8.8.8.8)

Log on the AX10 only shows these messages
(time is different from 11-11.30pm because I have tried setting up the device once again)
 

2020-11-16 20:34:53 Led Controller INFO [910] Start to run WAN1_ON

2020-11-16 20:34:53 Led Controller INFO [910] Start to run WAN0_OFF

2020-11-16 20:34:53 Led Controller INFO [910] Start to run LAN_ON

2020-11-16 20:34:39 Led Controller INFO [910] Start to run WAN1_OFF

2020-11-16 20:34:39 Led Controller INFO [910] Start to run WAN0_ON

2020-11-16 20:34:39 Led Controller INFO [910] Start to run LAN_ON

2020-11-16 20:34:37 Led Controller INFO [910] Start to run WAN1_OFF

2020-11-16 20:34:37 Led Controller INFO [910] Start to run WAN0_OFF

2020-11-16 20:34:37 Led Controller INFO [910] Start to run LAN_ON

2020-11-16 03:09:37 Led Controller INFO [910] Start to run WAN1_ON

2020-11-16 03:09:37 Led Controller INFO [910] Start to run WAN0_OFF

2020-11-16 03:09:37 Led Controller INFO [910] Start to run LAN_ON

2020-11-16 03:09:30 Led Controller INFO [910] Start to run WAN1_OFF

2020-11-16 03:09:29 Led Controller INFO [910] Start to run WAN0_ON

2020-11-16 03:09:29 Led Controller INFO [910] Start to run LAN_ON

2020-11-16 03:09:22 Led Controller INFO [910] Start to run WAN1_OFF

2020-11-16 03:09:22 Led Controller INFO [910] Start to run WAN0_OFF

2020-11-16 03:09:22 Led Controller INFO [910] Start to run LAN_ON

Log on the ISP-provided router/modem

Does not track or log any events at that time frame, like nothing even happened

Other notes

- I haven't tried yet is setting up Static IP between both routers instead of DynamicIP. Maybe there is something happening with switching the IP periodicaly (or DHCP lease renews?)

- I also run other TP link devices connected via powerline in my apartment, maybe this could somehow conflict and cause issues?

- I have 1Gbps internet connection, the highest my provider can get me, and usually have pretty solid network status both upload and download

- However, I have noticed that in the event of the issue happening, the TP link interface (Network tab) shows "Status: Poor connection" for a few seconds, then gets back to normal

At this point I'm just in a mood to resign, tried all I know or found here on this forum. Staying up till 3am trying to fix this so I can work from home the other day is just killing me, and if there is any brave soul that would help me fix this I'm gonna get you a copy of Cyberpunk 2077 or something.

(happy to provide any additional screenshots or info)