Let me first start off with my setup:

FX6300 6Core AMD Processor 8gb Ram 500GB HD R9 280X

Basically what happens is, during high stress moments in the game, my FPS will drop 1 one, then i will crash out to "unexpected error" Rolling back my drivers has helped somewhat, but i still get the issue.

Here is an example of when it happens. Also, it happens to my wife with the same setup but a HD 7850

Teleporting in to a zone for an S rank
Add phase for shiva
Add phase for t10
Heavansfall in t9
Teleporting into MD
Steps of faith

I have noticed it is better after i restart, it only really happens after the game has been running for a couple of hours.

Temps are fine, max temp is 73c with an average of 68c

I assume its a memory leak, is there a fix other than restarting the game every couple of hours?