Game constantly crashing in Dalaran

I have been experiencing a really annoying issue - my game crashes everytime I stay in Dalaran longer than 30 seconds.

Does anybody have an idea what's going on or how to fix it? I have downloaded the recent client with updated models, does that have anything to do with the crashes?

Thanks in advance for quick replies.

You can try several things I had same problem I just copied game files to another HDD and it worked fine BUT addons also can cause this that custom patch can also even god damn anti virus try everything of those things.