Ya, if there's ANY Thermal issues on CGMiner it's almost always bad contact with the board on your cooler.

This can go multiple ways
   Not tight enough
   Too tight
   Bad spreading of thermal paste


It pretty much has to be perfect on these boards for them to work. If you don't put the backplate on correct and the board warps a little because you have the cooler on too tight it can also give issues to the temp reader and cause errors too.

I guess what I'm trying to say is, keep repeating the cooler until it works