Sounds like converter was failing back o that July 4th trip (lights dimming/going bright) is classic converter DC output issue
110V AC only on Gen is a transfer switch issue
This week when you experienced the 110V problem where did you plug in.....CG pedestal, fairgrounds outlet, home etc.?
Did you check that AC power source....proper voltage, correct wiring (no open neutral etc. ) OR just plug in?
Check each system starting with DC System....battery supplied
Then generator AC power....then DC system via converter
Then shore power AC...then DC system via converter
I think you will find converter has failed and you have an issue with transfer switch.
Meter time.........