One thing to consider... I'm fond of saying that many RVers have a few screws loose.
Now,, Lots of folks come back with "Quite a few" but in truth, I mean real screws, metal screws, not Mental screws, that's not my department.
When My rig was new I had intermittent operation of the air conditioners, Sometimes they just flat would not work.
Finally I removed the cover from the breaker box (one day when I was NOT plugged in) and tightened things down.. One screw took 2 and 1/2 full turns before it became snug.
My advice: Check all connections, You may have a screw loose somewhere, or a wire nut (Had that problem specifically on the Xantrex itself)
Home is where I park it!