Ubuntu Server 20.04.4, randomly disconnects from LAN, after disconnects, most of the time, all network related commands will result in a 'hang', meaning no error messages, just a blank line after command. Only way out after that is a hold power button reboot, because even Ctrl+Alt+Del doesn't work properly, it just takes forever to run through a bunch of steps, always hang up on closing something, I waited for 5 mins and tried forcibly reboot, still not rebooting, as showing in this picture.
I say most of the time, because just now I ran into a disconnect but was able to run network commands without any issues, in this case, it seems ethernet is connected ifconfig, but when pinging gateway or any other computer on the network, I got Destination host unreachable.
Also this is the error message I saw in console when the first type of crash happens, not sure if it's helpful:
Error message on the console after ethernet disconnected
Edit: I'm running Ubuntu Server on my Surface Pro 4 laptop, and connecting to ethernet with an usb-to-ethernet adapter, wireless is disabled.
Edit: I have already tried all the solutions I can find online for similar problems including disabling power management on usb ports, restarting network services, checking for firmware upgrades etc.
