Pretty sure it's a software problem as have seen people complaining of the Lumia 920 doing the same thing.
Seems like Microsoft rushed WP8 a bit.
Any idea if there is a fix in the works? It needs to come quick, because these reboots are getting on my nerves.
Also, my 8X has serious problems picking up audio. Whether it's through a call or when recording video, the device is almost unable to pickup my voice. I have to put the mic right next to my mouth and speak much louder than usual to get it to recognise me.
Anyone else with this problem?