The freezer temp runs from a low of -5 to -10, up to +40. It seems to be on app. 12 hr. cycle. The compressor will run for 3-5 hrs. & the temp drops. The compressor does not run for 7-8 hrs. & the temp. climbs.
I had a local repairman look at it & he declared the "adaptive defrost controller" defective. After replacement, absolutely no change in the behavior. The repairman refunded (most) of my money & washed his hands, saying he had no way of diagnosing the problem, & couldn't afford to throw parts & time at it.
What could be the problem?