This is getting to be kind of a common complaint from 2000xl. The software is buggy. No OS updates that fix the problem that I know of so I guess you just gotta grit your teeth and start over until they get to it....If they get to it.
By the way, I've never had a 60, 60ii or 3000 lock up on me that I can remember. Ever. (Sorry man, had to say that. I'm not a fan of the 2000's at all!)