Microsoft have declared through The Wall Street Journal that they are investigating reports of certain users experiencing reboots and lock-ups. This issue is apparently affecting Windows Phone 8 users at random, withintermittent and inexplicable system crashes. The effected handsets are the HTC 8X, and Nokia Lumia 920. Since the company hasn’t figured out the cause of the issue, they are not making any promises. However, Microsoft are hoping to release an OTA update before the end of this month.