I am having the same issue, also on a Windows 11 machine.
At random times, both the ethernet and wifi will “disconnect,” and although sometimes it will say that both are still connected the connection is essentially dead.
Windows troubleshooters can find nothing wrong. I didn’t go the full “nuclear” route of a clean reinstall of Windows, but instead did a repair install and that didn’t work either. Neither did reinstalling or updating the ethernet drivers…
I was even considering buying a PCI ethernet card thinking that the connections on the motherboard were failing. However, before doing so I did a clean boot and, through a process of elimination, discovered that the problem is Plex Media Server.
Stopping PMS (1.30.0.6406-f3f2fcc0a) from booting with Windows “fixes” the problem, though such a “solution” is obviously not ideal since it means not running PMS. I’ve tried uninstalling and reinstalling Plex, and even tried rolling back two versions, with no success either. I am not sure whether something is “left behind” after uninstalling PMS that an older version doesn’t change or if this is a problem with the two preceding versions that I hadn’t noticed.
It would be strange if the problem wasn’t with PMS and the OP and myself are coincidentally having the same issue with our modems at the same time, though I guess it’s possible.
Whatever the case, I hope someone can figure out what might be the issue.
