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Could be a different retailer had the gen1 units and didn't issue any sort of recall.
However, from my own experience, I know that mosfets in general are sensitive to what kind of motor you're running.
For example, if you're motor had some kind of defect that makes it draw too much amperage (systema magnum comes to mind), then your mosfet is extremely likely to overheat very quickly and either trip it's resettable fuse, blow it's slow blow fuse, or melt.
And it's not just restricted to after market motors, I've seen a few G&P M120s develop internal shorts. One was destroying LiPo batteries by over-current draw. And another had actually melted the solder of it's motor connectors causing it to disconnect.
So, it could be a batch of gen1s, it could be they were installed incorrectly or the wiring arced through the body (I've fixed at least a dozen of those), or the problem may not have been the mosfet at all.
More details would be needed to determine the actual point of failure.
Like one could say the systema hop adjusters are crap because they keep breaking, when after investigation you find people are just tightening the shit out of them and breaking them lol
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