Frigidaire defrost problems

I replaced the defrost thermostat about 6 months ago, and now it appears my fridge is having a similar problem. The freezer is fluctuating but still cooling to 0- 20 degrees this time. The cool side will only get to 50s…did seem like my ice cream was melting this morning, but that was before I put a thermostat in to see how cold it was in there. I moved it, but everything else seems pretty solid. Any ideas?

I cannot find any info using the given model number, tried 3 sites including Frigidaire. Please check it.

I would remove the evaporator coil cover so you can check the coils to see if you have a defrost problem again.
Check to ensure the compressor and it’s fan are running.
Check that the evaporator fan is running. Note some units only run the evap fan when the compressor is running.

I had updates this morning, just submitted another post, because the attachment wouldn’t work in the reply…but it didn’t work in the new post either…any other way to get pictures to you?