Windows Phone 8: HTC 8X and Nokia Lumia 920 bug report
Meanwhile, the first Windows Phone 8 smartphones already sold and it became known to accumulate reports bugs. Sun reports some users of HTC 8X that the smartphone restarts randomly during operation. Owners of a Nokia Lumia 920 also report of spontaneous reboots or the fact that the system freezes completely.
Since two smartphones are made by different manufacturers this could be a software bug WP8, which will hopefully can be repaired by next WP 8 update.