I have a frigidaire commercial that has been going strong for around 17 years. I defrost it regularly. I also added two large bags of ice, one on the top shelf, one on the second from top shelf to help keep things cold since I don't have the freezer packed with food.....

I also have these special refrigerator and freezer thermometers which really help determine when something is amiss. I don't know how I lived without them before......

https://www.amazon.com/AcuRite-Refrigerator-Thermometer-Temperature-Customizable/dp/B07XD68GX6/ref=sr_1_5?crid=CGP3QSBN7B22&keywords=freezer+thermometer+with+alarm&qid=1660144622&sprefix=freezer+thermometer+with+alar%2Caps%2C296&sr=8-5