This is most always the motor itself is failing. Basically the way to confirm this is to check for voltage at the motor and make sure it remains at 12 volts when it is on high. Then if it doesn't move like this again then we need to replace the motor.
Here is a guide that will help with this testing:
https://www.2carpros.com/articles/how-to-check-wiring
I then included the wiring diagram to be able to check the voltage at the motor.
If this proves out then I included the process on how to replace the motor from the manual.
Please run through this material and let us know if you have other questions.
Thanks
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Saturday, July 31st, 2021 AT 6:24 PM