I think there might be something wrong with 10.2.  I have 2 identical rigs.  One running 9.8 and super stable.  The other rig is on 10.2 and windows gets really sluggish after 3hrs of mining. I couldn't even move any windows around and afterburner becomes unresponsive.  I am going to switch my 10.2 over to 9.8 and see if that will make a difference.