[Land Yacht]

Mike,

Well, as I am sure you know, this story does not make much sense.  Under normal circumstances, when the batteries will no longer transition to float it is time to check the RV maintenance budget and buy some new batteries.
I can only suggest you check the settings on the inverter/charger, but why would they have changed?

After that I am with you - take it back and hope they will take care of you.   Good luck - Russ EE

I wondered if 1 battery was bad causing the issue. The tech on the phone picked to isolate the battery that cooked the most water out of it, but that was not the answer. The batteries are only 2 years old, and charged fine prior to service. 

I too thought surely they did not change the settings...