First I am not sure a fridge in a garage is covered by 210.52(B)(1) ex2. That only refers to kitchens. I am not even sure I would recommend the modern fridge be on a dedicated circuit if it is not in the kitchen. My side by side only pulls a bit over 3a.
As for your tripping, I wonder if you have sags coming from the generator that cause slow starting of motor appliances.
Is the microwave on that "light" circuit? (which would be a violation)
What other PC equipment do you have in the bedroom? Again a sag might make switcher power supplies draw excess current.
Do you have a recorder?
