I have noticed in those cheap motors the bearings tend to be rather hit or miss so maybe the bearing took a dump then overheated the motor idk.
Mine is the 3665 3100kv https://www.aliexpress.com/item/2251832450138245.html?gatewayAdapt=4itemAdapt I originally bought it for my Ruckus but it was a bit overkill for it. Now it sits in my Slashpede 4x4.
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Whoa! Just saw Amazon has a 3674 that has some pretty good reviews. I can’t imagine the low end that thing makes