50 amp question

Bad neutral connections at the source sure gives off some strange readings on the typical two zones of circuits. When the current rises on the neutral leads it takes away from one zone and adds to the other zone... They all use aluminum wiring now in the feeders and corrosion sets in by having two different type of metal being used. They use a special greese around those aluminum connections that helps big time... It all tries to equal out to the 240VAC source voltage with 120VAC on each leg and zero volts on the neutral being the desired outcome.

Indeed your surge protector device may have saved you some high dollar expenses by shutting down for the unbalanced conditions you was seeing.

Roy Ken