Mine did that and it was due to a frozen water line that blew out the thermostat. See if the water line is frozen first. It was located on my refrigerator behind the crisper drawers. the tech had me use a hair dryer to thaw out the line
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I had a similar problem where my evaporator coil was freezing into a block of ice, which caused my fridge to warm up due to a lack of air flow. I fixed this by doing a few things. I replaced the circuit board ($100) which was easy to do. Unfortunately, this didn't fix my problem so I took the inner fridge cover off to view the evaporator/heater coil assembly. I checked my thermo fuse and found it to be open (failed). I ordered the thermo fuse and the thermistor and replaced them both. I then plugged the fridge back up and put a regular thermometer inside the fridge to get an accurate reading of inside temp. A few days now and everything looks good. The board, fuse, and thermistor were all pretty easy to replace.
What happens is the defrost is controlled electronically from a circuit board, when this goes bad, the freezer quits defrosting, and freezes the fans that circulate air through the fridge side of things.
To check this, unplug the entire fridge, leave the freezer open, wait for it to defrost a bit, if this causes the fridge to start cooling again when you plug it back in, then its the defrost. You should also see ice crystals on the back of the freezer just under the icemaker.
There is a timer that controls the refrigerator defrost cycles. This is located behind the kick panel at the bottom of the refrigerator. Remove the panel and look for a dial-like device toward the front. Try to manually turn the timer dial and listen for an audible click. No click, no defrost. Call a NEW repairman and have him check the defrost timer. Hope this helps.