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Inside the cooler is the evaporator fan usually right in the middle behind a cover. As it slows down you have less circulation and ice forms quicker and cooling is diminished. Sounds like it is going out.
The gasket would be the last thing I would suspect. Is the ice a ball to the left side or is it all the way across? Could be a sealed system issue or a bad thermistor. I would recomend calling a factory authorized servicer for proper diagnosis before putting the money into a gasket. Besides look at the gasket all the wat around for any damage and make sure the door is closeing properly. Isee units with torn gaskets all the time and it doesn't cause ice build up in th refrigerator side.
There is only one possible source of these ice crystals -- moisture precipitating from the air (condensate) -- this air is coming from outside the freezer. It's either getting in when the freezer is opened or coming in around the gasket.
You might try a very thin coat of vaseline on the gasket to get a better seal.
The solution posted previously is TOTALLY WRONG. A Sub Zero ref doesn't have a heating element in the fresh food section. Only in the Frozen food section. It has 2 totally separate systems for each section. 2 Compressors and 2 evaporators. They share a condenser. If you are having ice build up in the refrigerator then the problem you are having is a refrigerant leak in the fresh food evaporator. You need to have a certified tech come out and replace the evaporator in your refrigerator section of your Sub Zero. Not sure what you are asking about the thermostat.
remove back panel inside freezer. you will see drain tray at bottom with a drain hole in the middle - this is blocked usually with ice. melt off with a hairdryer and follow up with hot water till water flows away freely
check your freezer door see if it (ajar) what you can do if you can unplug unit clar drain with hot water then get apiece of shave wire hook on the defrost heater and put in drain line 1/8 in the drain line put back wall back together and plug unit in
check freezer for frost build up and if fan blowing, check condenser make sure clean, and fan blowing,
check vents in refrig. make sure no blockage, freezer control should be in the middle setting,
you can try turning that to Warmer freezer allowing MORE air to refrigertor side.