[mhs4771]

Here's the spec right from the manual for your unit:

High/Low Voltage Protection: The EMS continuously monitors AC power When AC
power deviates below 104 volts, for more than six (6) seconds, or rises above 132
volts, the EMS automatically shuts down power to the RV. Once the AC power rises
above 104 volts or drops below 132 volts, the 2 minute 16 second (136 seconds)
time delay counts down and power is restored automatically.

So it's working exactly like it should.