Hello All!

I need help! Here is what's going on:
-The Power Liftgate will randomly open/close, I notice it specifically when the door locks are initiated, like when I shift the car into park at a grocery store
-Both the exterior latch (under the licence plate), and the close button on the inside of the door will randomly picks and chooses when to work or not work, as well as the on/off switch on the dashboard under the radio.
-It will stop working all together including all switches/levers/and key fobs

Here is what I have tried:
-Changing the 30a fuse under the hood associated with the powerliftgate
-Resetting the key fob by holding the liftgate button down while the vehicle was in auxiliary power

Here is what I'm considering:
-Changing the exterior latch under the license plate
-Maybe investigating the rear control module

Any help would be very much appreciated, I'm trying to avoid the dealership if possible, my Enclave has 54,000 miles on it, so I'm off warranty, yikes!