KM....I have a 2018 Outback and run into the same issue. I'm sort of used to it by now. My right side refrigerator works fine on auto, but the left refrigerator acts up>most times I have to push to gas mode?
I've had it into my Dealership on several occassions; everytime they said their was no mechanical failure.
Get this......the left side frig is a 2017 model and the right side is a 2018?
Again my Dealership & Keystone would not replace the 2017 version. I was told by my service rep tech that sometimes depending on parts available at the factory....they use what they have.
It is what it is....love the trailer and both sides work, one just works better most times on the gas feature.
PS....I discovered this on the walk through and pushed to have it replaced-Keystone & Dealership said no can do.
Good luck with yours.