Re:Sandwich prep cooler problem
I would think It either needs freon or the thermostat is going bad.
I have a True also, brand new the thermostat went out in less than a year, repaired under warranty. I replaced that one about a year & half ago and is showing signs of going out again (runs and won't shut off when it should, starts freezing during heavy use, other than that, holds perfect 39 degrees.
The repair guy told me that True's are bad with thermostats .
The part was about 80 bucks, took 15 min to change.