daniel i think it is a classic hot sensor!
i have had the same issue with my 60da.............. a couple of pointers to reduce it is if you have live view when imaging turn it off, also the battery heats the whole camera up too so i have a 12v dummy and the swivel screen on the 60da is a big help as you can keep that away from the rear of the camera......... all of these things cause heat
but i am sure your sensor is overheating
pat
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