Could be a bad fan, or could be an overheating CPU. If you open your case, clear out any dust, and run the CPU fan at 100% through AMD OverDrive, does it still get to those temperatures? 125F (51C) is high, but not the limit for that CPU. Try the open-case, clearing the dust, and ramping the fan up to 100% to see if it's just a bad fan, or a bad CPU. If the case being off and fan at 100% takes care of it, look at your case ventilation instead of the CPU/fan as the potential cause.
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