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They probably got overheated too much and it just can't take that kind of stress. Drills usually don't cool exceptionally well, and over the course of a match, especially when the motor changes forward and reverse, they get darn hot. Especially if they aren't heatsinked. (I wish they'd include aluminum heatsinks in the kit...) Overheating and inadiquate cool-down time most likely killed your motors. At least that's my take on the issue. I could, as always, be completely off-base here.
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