It sounds to me like there is the possibility your Relion Batteries BMS is cutting power to the batteries during the charging cycle. I have had similar problems but not identical. I would also confirm you have the following TSB completed:
https://www.thorforums.com/forums/f4...tsb-33344.html
Very simple to check but might make sure your dealer is aware while it is there.
It is a timing module but it has been known to cause problems with the battery BMS system (battery shut down). If your batteries are shut down by the computer they will not charge. I have had the Mastervolt display "charging" when it was not when this has happened.
I have had my charge process interrupted several times for unknown reasons but at this point suspect the Relion BMS computer could be causing this.
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