I haven't had a crash for 2009 in a long, long time... like a whole day !... nah jk, it's been many WEEKS since I had a fatal error, probably... the worst I've gotten is a -freeze- sometimes, when handling decently large 3d models with many also large xref'd models. Even then it's only been once a week maybe, and only after I'd left Autocad open for a couple days, probably
My only gripes now are actually how certain things function (or fail to)
Sorry I can't help.
Is it a random occurrence?
You could always file a subscription center ticket and get some tech-jockey-know-nothing to tell you that he doesn't know why, either