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I would take it apart just for cleaning and lubrication if you've gamed it 50 times already.
A struggling motor can mean that the gears are seizing due to debris and gunk or that there's a wiring issue or there's a motor height issue or a battery issue. Anything in the above combined, really.
Alternatively you could always just swap out the motor and if it fails to function afterwards you'll know that wasn't the (only) faulty part.
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