For the two last months, I've experienced lockups in AH.
After about 10 - 15 minutes gameplay, the application freezes down (Hitting Num Lock key, I can see a delay of bout 1 second with the little light on the keyboard).
If I am lucky, it will come back after 5 seconds, if not (which happens 90% of the time) It'll lock up untill I get a "lost connection" message, or simply a CTD.
System:
I will post a DXdump as a reply.