just stabbing in the dark, but have u checked the voltage at the the outlet at your friends house. my guess is that its borderline too low and keeps crossing the line between too low and just enough. most appliances will handle significant voltage drops and household voltage does fluctuate a little normally, but if the house power is borderline then those standard fluctuations could be taking it above and below the line. Just a guess but worth a shot.
Hope it helps a little
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