Here is some information from a private message from NRALIFR
"That does sound like an auto-reset CB though. My much older Lance had one of those that was screwed to the OUTSIDE of the battery box, so you had to get to it through the cabinet under the galley sink. It was hard as heck to see because it was so high up on the outside of the battery box. Of course my camper is quite a few years older than his.
Other than that, I’d be looking for the ground bus on the low voltage panel and checking for loose screws. My camper has a low voltage fuse panel that’s separate from the converter/charger power center. I’ve had screws loosen up there and cause problem"