Could not find any info on the listed Model Number.
Here is a breakdown for PSI23SGNAFBS, yours should be close.
Sounds like it may be a defrost problem.
When you started it up and the evaporator fan was not working, it could be that the unit was in a defrost cycle.
When it happens again remove the covers from the evaporator and check the coils. If they are heavily iced up it is a defrost problem (No Defrost).
Causes could be control board, defrost thermostat (Open) or the defrost heater (Open - it is a glass type they go fairly often)
My guess from your description is the the defrost thermostat is not opening (intermittent). During defrost the thermostat shuts off the heater when the ice is melted off the coils. The machine is still in defrost mode but the heater is off. If the thermostat does not open, too much heat is generated and will melt food.