Our Amanda refrigerator/freezer has been making

Good day,
As a general rule, if the freezer is thawing, but the food compartment seems decent, it is usually in the compressor, or condenser fan motor area that cools the compressor.
Remove the bottom back cover, and try to determine if the problem seems to be coming from that area. If that fan motor, the condenser fan motor, is giving you problems, then if handy, you can change it yourself. But if any question it might be coming from the compressor itself, and since you have only 6 months warranty, on that pricey item, it might pay to have the selling dealer perform a service call for you.

It sounds like your evaporator fan motor, they last about 4-5 years. Try to see if the buzzing noise comes from the motor, usually in the freezer compartment behind a vented cover plate

The freezer is usually cooled by the compressor, the fridge is then cooled by an evaporator fan motor ($30). If this fan seizes or slows down then the fridge warms up (it sometimes starts squealing before this happens). It could be that your drain hose is clogged or frozen. Maybe the temperature adjuster go bumped.

If you think it is the evaporator fan motor:
Check to be sure you can get a replacement fan first, they last about 4 - 5 years. Can get from a parts supplier or electric motor company.
UNPLUG fridge. Located usually in top of freezer behind a vented cover plate. Remove cover, remove screws holding fan in, may have to cut wires. Replace with new motor, make sure the fan pushes air into the freezer area and doesn't spin backward drawing air from the freezer area.