Could be. We have two apartments both with Ariston fridges. One has a fridge compartment that freezes everything; the other fridge is too warm.
The thermostats have been replaced twice in both fridges but to no avail. We are now giving up on Ariston and buying a local product - not italian
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix freezers.