Surge Protector

[Lil Joe]

Hope some electricians can jump in on this one. I’m currently plugged into shore power at 50 A. I had a surge protector hooked up. Came home one night and the lights were extremely dim and the battery showed empty. Lights started flickering and our air fryer was beeping and flickering. The 110 plugs all worked, tv etc. Went and bought a new battery and all worked well again. I had a tech check the next day and determined the converter was not working. No reading coming out. However when he touched the neutral bar in the fuse panel he received a shock. Tested the neutral and it was hot. Tested a coach 110 outlet plug and showed 245 volts. Tested the surge protector at a 110 outlet on the post and it was fine. Normal readings. Disconnected the surge protector and all was back to normal. No hot neutral and normal readings at coach 110 outlets. I’m now installing a new converter and not using the surge protector…at least not this one. Is this possible that a surge protector that reads good numbers could do this. Went through this a few days earlier but all went back to normal on its own, till it happened again. We also lost our microwave about two weeks ago and now I think it was related to this.
Any ideas.