I've heard of similar issues with power liftgates. It could be due to a problem with the motor or control module. In my opinion, you should Try First to check for any obstructions in the sensors or tracks. You might also try resetting the liftgate system—your car's manual should have instructions on how to do this. Inspect the wiring for any visible damage or loose connections, and see if there's a software update for your vehicle. If these steps don’t solve the problem, taking your car to a dealer or mechanic might be best. hope the above will be helpful.
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