I made a topic about a year ago that read:
My computer (Windows 10) recently started waking up from hibernation with no internet connection (100% of the time). FYI I connect via an ethernet cable. The first few times I thought it was an internet issue as repairing indicated "there is no internet connect" if I remember correctly. Restarting my computer was how I first solved this problem the first several times it happened.
Now I learned I could go into device manager and scan for hardware changes, and that would sometimes rectify the network adapter issue. I noticed sometimes this didnt work so more recently I just disable and re-enable the device and it restores the internet fine."
Here is a link for reference: https://www.bleepingcomputer.com/forums/t/650923/network-adapter-ethernet-problems/#entry4278283
This never really got resolved on this forum and I just lived with it for the past year.
A new problem started occuring where sometimes after waking up my PC would not detect a network card at all, but a restart would fix this.
Yesterday I came home and booted up my computer and it was not able to connect to the network. Initially, under device manager instead of listing my Network Adapter, it listed an unknown Ethernet controller. I tried several things, restarts, scanning for hardware changes, and anti-viral/malware scans (all of which found no issues). It started showing up as a Network Adapter again, this time with a #2 which I don't recall being there before and a red mark indicating it is not starting or working properly. The card is an intel 82579v gigabit network driver. I tried installing the latest driver and it did nothing.
Please help. I hope I don't need a new network card, but if there is a way to know for sure I'd prefer that rather than constant issues and not knowing.