I get this a lot too; got it on W7 and still get it on W8. I get the 'C2 has stopped working' almost every time I close it.
I'd like to agree with @DUTOIT as well; if I have a project open for a while then it gets so sluggish and slow and becomes unusable, so I have to restart. This is particularly noticeable when selecting values from other game objects, and even worse when objects are in sub-folders. My new PC is ridiculously over-powered, so it's not an issue with specs