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Found the same issue on a well used G&G motor (M14 set as semi only and used as a DMR of sorts, with many BBs in the air at the same time), including on the bench, would spin then stop after a few spins, turn the shaft and it'd go again a few times then stop. Then............ it actually caught fire! Lol, smoke poured out of it and even half an hour later it was still very warm to the touch.
Nutshell, it's fucked, in the one I worked on it was a burned brush, the one you are working on is likely the same. Only fix is to buy another one.
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