inverter on/off when on shore

[2012/3750]

I am new and have had this 3750fl for a month.

I have a MS2012 inverter, I had shore power running and turned on the microwave for the first time and the tv and everything flickered and the AC overload light popped on my controller . I have tried a soft and hard reset neither fixed the shore power issue. If i turn on the generator everything runs fine like it is supposed to.

When I turn the shore power on the inverter takes about 2min to start and then runs for 5-8 seconds before it kicks off, if i leave the shore power on it will do this over and over.

Any idea on how to fix this issue?

Or is there a way that i can bypass the inverter and just run on shore power as money is tight at the moment and propane for the generator is expensive.