I've looked at every option and I've isolated it to my 3.8 motor. All my other motors work fine, my battery is new, but I also pulled the 150 mAh battery from the old microsizer (bought it from here or some other store). It's not the battery, the wiring, the axles. It's the motor. I guess I'll just get a replacement one. I know I didn't run the motor for 100 hours, much less 500+

Oh well.