Only time I had and issues with it was a loose connection in the rear of the toilet. I took the top cover off to get to the wiring. Wiggled the wires and one fell off. Put back on and all was good. I just lifted the back cover, it was glued down, put back on with Velcro.
Mine also a 2015 and were in it a lot.
Now the half bath toilet doesn't flush some of the time, think it is a loose connector cause I can smack it and it will work for a while.
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2015 Charleston 430RB