I've been running Windows Phone 8.1 Developer Preview on a Nokia Lumia 925 for the past few weeks and everything has been fine. I come into work this morning and I notice that the WiFi is off. I tried to switch it on but I'm immediately presented with an error message: "Can't do this at the moment", e.g.:
To try to fix this I've restarted the phone, done soft & hard resets, updated everything that needed updating, and restored to factory settings. Nothing is working, and this error message doesn't give me any information.
What could be causing this and how can I fix it?
To be clear, this is not an issue with connecting to a router, this problem lies in turning on the phone's WiFi module. Also, Internet Sharing is turned off.