Ok, I've figured out whats giving me so much trouble.
In between defrost cycles, ice starts building up on the evap coils.
As it does, less air circulates to the fridge. Freezer stays cold. So
less air in the fridge, makes it warmer. IDK why the thermistor, which is
new doesn't compensate. Instead my fridge gets warmer until the defrost
cycle kicks in. Then things are back to normal for a while....
What do you guys think?