More then likely this actuator is failing. I am attaching the process on how to replace this but can you get a video of this just so we can see what it is doing?
There may be a chance that this is unlocking the door for a reason so seeing what the lock is doing will help us tell what could be happening.
Here is a guide that will help with removing the door panel:
https://www.2carpros.com/articles/door-panel-removal
Let us know what questions you have and if you can get a video. Thanks
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Thursday, December 17th, 2020 AT 1:30 PM