I would say you need to bring it back to the dealer or service center. I have the exact same unit, purchased in Feb 2015 and mine runs fine on shore power, however I have had it shut down after 1-2 hours using a generator. The difference between low fan/ auto and high fan puzzles me. If it was insufficient voltage, I would suspect that would happen on high fan or auto with high fan operating, not low fan. I'm still troubleshooting why my unit shut down using a generator. I live in AZ and it was 108 degrees at the time. Need to do more work. Use your warranty before it expires. Cheers.
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