Windows 8.1 wirelesss computers configured to do machine auth on the windoes logon, but for some reason (like timeout), they need a technician to manually connect them to wireless network if a remote management needed (patch, GPO, and etc.).
I found some informaiton about Machine Authentication Cache Timeout here, but not sure if that's the only possible cause or there's something else on Windows itseld also that could be configured to avoid it?