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Hi my name is Robert..
I must say this is an odd one. What I would do is plug into a different outlet outside the RV with an extension cord, if it still does the same thing then the TV is the problem. IF it does NOT do the same I would check the outlet it is plugged into with a polarity checker, if there was an issue with the wiring at the outlet it might cause this type of problem. Most places like Home Depot have the polarity checkers for a few dollars, it will tell you if there is a wiring issue present such as a ground, open neutral etc...... IF you still want a refund please let me know. I am responding not in a day. Robert