Had a similar issue on my 2011 MA and talked to Newmar. The "old" style assembly tends to have grounding issues and they now have a replacement design available. I had mine changed out and it works fine but.... suddenly three doors on that side decided to work intermitantly.
They would not lock and seemed to randomly cycle to unlocked on their own. It seems to stop when I have the gen running. Not sure if it was/is a low voltage situation, dirty contacts/relay or lack of usage due to my wife being ill for an extended period.
If you do replace it, just double check the other doors to insure that they cycle properly.
One very understanding & patient wife
2018 London Aire
2014 Grand Cherokee