Originally Posted by bakken
Probably just a "brownout" in the area, where the voltage in the whole system drops as demand outstrips supply for a short while. This can happen just before they bring an extra power plant on line to meet increasing demand.
Without the Surge Guard, you probably wouldn't have noticed it.
Sounds right to me as well. The campground could also have had a step down line transformer issue that was repaired by the electric company.
Keep monitoring your voltage. OBTW, having an autotransformer will keep your AC humming when others on your circuit are trying to live with no air conditioning.
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