I'm using a PC, so I can't say anything about the hardware stuff. But as for the time when it's happening: I find my Vue to be rather stable as long as I don't fiddle too much with stones. Whenever I'm about to insert a stone object, I save my scene before doing so, because moving the stone around quite a few times to get it where it suits the picture (or latest doing this with a handful of stones) Vue will usually crash sooner or later - especially when lifting, moving and dropping them. Just a hint to keep an eye on whether that's the time for you, too...