let's consolidate our information and feedback into one post in the bug forum to help out the HTC crew in tracking down the problems.
http://www.hitechcreations.com/forums/showthread.php?s=&postid=554588Be sure to post your system specs (as a common theme might show up) and what you were flying, what you were doing, where you were and what was near you (as per what HiTech said in his post.)
Also, this is just for hard system lockups. If you had a disco or crash to desktop, please start another thread. Let's keep the above thread to the specific problem of the screen freezing on you.