Dometic non-adjustable temp settings (AUTO Temp Control) moving thermistor can affect fridge temps but only minor (6*F-8*F) overall.
Moving it UP =====COOLER Temps
Moving it DOWN ===LESS Cooler Temps
IF you can change the temp settings ...adjustable temp control---then thermistor S/B attached to far right fin mid-position.
Moving it up/down would have little affect due to adjustable temp settings
Items freezing in food compartment ======thermistor hanging down (not attached to fin) OR bad thermistor
Thermistor senses FIN temp.........if not attached to fin fridge cools continuously causing freezing (same effect bad thermistor has)
Your thermistor is bad.
Check out Snip-The-Tip for replacement option
LINK