RAX80 randomly disconnects LAN cable

I've been having the issue and have been working with support for some time now. I just wrote this summary for them that I think might be useful for other people so I will paste it here

My setup
Internet - Router (Mikrotik) - Router in AP mode (RAX80) (this is my desired setup)

I had (and I still have it here) another Mikrotik router as an AP that I wanted the RAX80 to replace

The issue also happens in the following setups

Internet - Router - Router in Router Mode (RAX80)

and

Internet - Router (Mikrotik) - Router in AP mode (Mikrotik) - Router in AP mode (RAX 80) (yeah that's 3 routers I tested even this way)

- The router drops connection on all of its LAN ports at the same time including the WAN port. I know that because I have 3 Windows desktops computers that drop the connection at the same time and the log shows event that looks like this

[Time synchronized with NTP server] Tuesday, Apr 20,2021 20:11:35
[Internet connected] IP address: 192.168.0.3, Tuesday, Apr 20,2021 20:11:35

These events are logged at the exact moment the PCs drop connection and indicate that the RAX80 is not only dropping the LAN connections but also the WAN connection to the parent router

- It is the RAX80 that is dropping the connection and not the internet. I know that because I ping the internal IP address of the RAX80 and when the issue happens the ping to the RAX80 is dropped as well not just the ping to Google

- It is the RAX80 because I have tested in the 3 router setup that computers connected to the RAX80 would drop connections and computers connected to the second mikrotik router would not

- It is the RAX80 because there are other people on the forums experiencing the same issue see https://community.netgear.com/t5/Nighthawk-Routers-with-WiFi-6-AX/RAX80-Short-Disconnections/m-p/1859440 and https://community.netgear.com/t5/Nighthawk-Routers-with-WiFi-6-AX/RAX80-randomly-disconnects-LAN-cable/td-p/1772176

- I have tried resetting the router, I have tried running newest and older firmware

- I have tried using the router in router mode (additional internal network). Same issue

- I have tried setting static IP addresses. Same issue

- When the disconnect happens it is just momentary. However the windows machine go into network identifying procedure (I can see this by pointing at the tray icon and seeing "Identifying"). The whole things takes less than 5 seconds and is random so I don't have much time to check other places. It seems like there is something that causes the network to reset and the actual lag is because of this renegotiation

- The wireless doesn't seem to be affected despite the fact that the WAN connection is also dropped. My hypothesis which I cannot prove is that the routers are able to negotiate between each other almost instantaneously while the Windows machines take some time so the wireless devices can't feel the drop.

I measure all this by constantly running pings to the router internal IP (in my case 192.168.0.3) with the -t option which simply runs a ping forever. When I feel the drop in some software I look at the pings and the network tray icon to confirm the issue. The ping goes into "General failure" response for a few seconds before returning to normal. (Note this is not simply Request timed out)

One thing I have not tried is changing the MTU settings because it is not available in AP mode and this is how I want the router to work ultimately and also I people on the forums have tried it to no effect. I am ready to try setting the router in router mode again and try it but I am sure it won't help

I also believe this is an issue with the model and the issue might even be for every unit and people just don't notice it or think it is their internet that is failing. Obviously I can't know for certain but there are multiple people on the forums and nobody managed to find a fix with or without help from support.