My Tuscany had a similar problem. Turns out the romex wire went from the breaker box to a duplex socket nearby that uses the poor insulation displacement push in connectors. It was 12 ga wire and they tried to crowd two wires into the spring thing and one didn't make contact so no current able to continue down the wire. Spliced them outside the box with wire nuts and no more problem with the induction stove top, a higher current device. This type of socket is used everywhere in RV's.
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