Mine started this exact issue a couple months ago and occurs at random. Entire interface locks up and will reset then lock up again. Just this past weekend it said there was a map cd/DVD error then froze, restarted and froze again. I am wondering if it has anything to do with my duplicated map DVD that was recently installed. I ejected the dvd and installed the old dvd, it booted up quickly and is still working. Will be keeping my eye on it.....