The freezer in my refrigerator freezer isn't freezing
My elderly dad and step-mom have a nice refrigerator/freezer which hasn’t worked well for the past few years. It’s always the same problem. The refrigerator is fine but the freezer will occasionally quit freezing resulting in items spoiling by the time they realize it. After it’s emptied out and cleaned, it still doesn’t work. They call in a repair person and it usually starts working but they’ve never been able to convey to me what was wrong. Sometimes the repair person can’t figure it out but a month or so later, it just starts working again. (They have some forgetfulness problems). It’s broken again and they can’t afford the repairman (who may or may not be able to fix it). Any suggestions? It’s possible that they are doing something incorrectly.