I also have unexplained low voltage errors even after my batteries tested perfect under a load. While not fixing the problem, a Thor rep gave me a bandaid solution... granted it is pretty annoying. Always before attempting to level, trip the Buss flag intentionally, reset it & then (the part I had never heard before) cycle the disconnect switch off then back on (USE to STORE & back to USE) then wait for a minute for the electrical system to reset. It generally works but I would give my eye teeth to know what is actually causing the issue.
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