The issues are mostly reported on the HTC Windows Phone 8X and the Nokia Lumia 920, so it seems that we are not dealing with problems with a particular handset, but rather with the platform.
The most common complaint is that the system would randomly freeze and reboot. The frequency of those reboots varies, but some users complain it happens once nearly every day. Devices would also freeze randomly.
The other grievance is about a quickly draining battery. Now, it’s interesting to hear from you, our users, whether you have experienced any of those issues on your Windows Phone 8 device? We’ll keep an eye about a possible solution, and let you know when Microsoft patches this.
source: Microsoft Support, WP Central via The Verge