How bright is your power led ? This can indicate if theres a power issue especially if its fluctuating. Maybe adding +5v to the Fan connector on bppc will help although bare in mind it may damage the card so it will never work for fan power again.
Ive been fortunate with my bvision in that its had zero issues with an early rev0 bppc and doesnt get particuarly hot either. Using latest flash version and latest cgx4
