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That's a classic symptom of an open or high impedance neutral. Most of the surge protectors are supposed to catch that condition; and it's troubling that it cleared after unplugging and plugging back in.
Fortunately, there aren't many places that can occur. If you do have a solid neutral at the pedestal, that leaves the male and female plugs on your shore power cord, the inlet plug on your RV, and the breaker panel itself. There is a very remote possibility it's in the cord itself or the cable between the inlet plug and breaker panel, but the odds of cord damage that just cut through the neutral wire and only that wire are very unlikely.
The troubleshooting for this condition is highly dependent on your comfort level working around electricity and skills using a multi meter.
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