Food thaws might be leak of air at door seal

Either the door seal is bad or the freezer has a refrigerant leak or a bad compressor. Best to have an appliance tech check it. It won't take him long to locate the issue.

you may have ab ad fan inside the cooler and all of the cold air is staying at the bottom. Also there may be bad insulation at the top and there may be warm air up there.

Seal needs to be replaced around door. Make sure magnetic strip is tight against sides of refrigerator, even if you have to cut the outside so it lays flat against the sides.

seal around freezer door may be warped/old/cracked... or thermostat is not working properly.

Try duct taping door as tightly shut as possible and check around the time it freezes to see if that fixes the problem. If so, the seal (that has magnets so it will seal completely) needs to be replaced.

If that doesn't fix the problem, it could be a faulty thermostat in the freezer.

Check the door sits straight and square on the front. You can "adjust" with the heel of your hand to make it sit flat against the frame. Even a poor seal shouldn't make frozen food thaw - check and clean the condenser and fan

Freezer burn to food is caused by air & moisture in contact with it.
There should be a tight seal by the rubber gasket along all the inside edges of the freezer door. This gasket prevents unwanted hot moisture and hot air from entering the freezer compartment and causing ice build up. You can test the integrity of the rubber gasket seal by seeing how the freezer door will pinch a slip of paper in various spots around the freezer door. If the slip of paper pulls out easily, there is not a good seal at that spot. If that's the case (which I believe it is), the door gasket needs to be replaced. By the way, ice will build up over time because you need to access the food in the freezer, hence you will introduce moist air each time you open the freezer door.

check your door seals. warm air leaking in can keep it from reaching it's temp. also, the condensation will collect on the evaporator coils causing them to freeze up. when they do, there is no air flow to cool the rest of the fridge, so the compressor will run constantly trying to reach the set temp. empty it out, thaw out the coils, and check your door seals for leaks. if it still happens, you might have a slow freon leak.

a leaking gasket can cause food to thaw and it can be fixed if a new gasket is avaliable from local appliance parts place..the gasket is held on by the liner which is removed by gently lifting the gasket and removing the screws..the reverse to install the new gasket

Might try unplugging for a few hours and then plug it back in. There is a possibility that it slugged the compressor and there is a restriction in the line. Sometimes when the compressor fails to stop running in cold air the liquid gets back to the compressor. It can cause a bit of gunk to be picked up out of the oil and carried to the expansion line and plug up the line. Maybe turning it off will let the plug fall free and not replug the line. Worth a try anyway.....

The door seal is damaged or the hindge alignment have allowed the warm air to enter and the cold air to leak out the of the freezer. Look and feel around the door for the cold air and check the top and bottom hinges to make sure they haven't become loose. Look for tears also around the seal because this will do the same thing. Let me know what you find. JT