I am on Windows 10 with my Toshiba laptop. It happened to me a couple of times and I don't know if it is a virus attack? My computer would lost internet connection. I am wired into the router. But the laptop doesn't show the network icon anymore on the lower right corner. Then when I login in, it doesn't recognize my password. Both times, I fiddled with it for about 30 minutes and still not able to login or connect. I took the easy way out by restoring the system from my Macrium mirror image. The machine works normally after the restore. Any idea?