Hello, Well I have been folding on a Dual 2.0 G5, and recently I have encountered three of the following types of messages which says: Simulation instablility..check if your computer is unstable or too hot. ? The WU then stops running, sends the data that has been done and retrieves another WU. I never hear the fans coming on, indicating a hotter state, nor do I see a temperature spike using Temp. Monitor (I'm not sure how reliable this app is though). I've noticed no other symptoms like crashing, slow downs, or apps quitting. Everything, but the WU quitting, is perfect. So any ideas why this is so? Is it normal? thanks in advance.