Thanks for the error logs, unfortunately, they didn't yield any useful information for me.For me, the crashes became more frequent... almost every game. Though games that use lots of resouces always crash on my computer (like SC2, i think its because of my motherboard), War3 usually worked good. This happens in 1.2a (6). Sometimes even 2 different error messages appear.
Edit: I'm running Windows 8, using legal copy of wc3. Here is 2 error logs.