Hello, I've been having this issue I have windows seven. Decided to get a MSI motherboard which came with the Killer Network lan chipset. Installed the drivers and everything was working fine, IPV4 and IPv6 connected. After I leave, the computer goes to sleep. Then When I come back and wake the computer up IPV6 is connected but IPV4 is no longer connected.
Still able to type things in the web browser, it even does the quick search. Like when you type a few words it tries to finish your search by spelling out a few things. So everything seems to be working or connecting to a degree. Trying to go to any webpage it never finds it. I've tried a few things that usually work like resetting the card or running windows diagnostics, but nothing seems to work until I reinstall the drivers. Why does it keep dropping IPV4 connectivity. I've run into many other networking issues but nothing like this. If anyone has any suggestions let me know.