I'm seeing quite a few Windows 8 computers that spontaneously lose hardware devices. They'll still be there in device manager, usually with a "problem". I've seen it with WLAN adapters about half a dozen times and once with an audio adapter. The issue always persists across reboots.
It's solveable by deleting the offending hardware item in device manager (without removing the driver software) and then scanning for hardware changes, upon which the device magically reappears in a working state. I'm not sure if a reboot is sometimes needed, it certainly isn't always needed.
I showed one person who is seeing it every couple of weeks, but he managed to delete the driver software as well so I'm looking for a better solution. Anyone else seen this behaviour, and does anyone know what might cause it and how to stop it happening?
Apologies if this has been posted elsewhere - I couldn't find anything relevant with a search.