Refrigerator is not cooling as normal.

Jimmmyj is probably on target with the timer.
All frost-free refrigerator-freezers have a thing in the system called a Defrost Timer. The thing is a little clock of sorts that tracks accumulated running time. Every 8 hours of run time the thing cycles through a defrost cycle. The defrost cycle is necessitated by the humidity that forms ice crystals on the freezing coils, if the frost is not eradicated it can build up to the point where no air flows over the coils to chill the inside of the box. The Defrost timer in all boxes fails eventually from old age. When that happens, the coils frost over until they become pretty much just a solid block of ice. Most timers are located on the front of the machine, behind that removable grille under the door. The timer has a round hollow shaft through it, and can be turned with a screwdriver. If the compressor is running, give the shaft a slow twist until a click is heard. The compressor will stop. Give the fridge an hour to defrost the coils, and check it to see if it took off running. Sometimes the nudge will make the timer run for a while. If this is the case, the unit will chill, and buy you some time to get it fixed. If the timer does not run, you can repeat the process daily until you get a replacement timer. If the unit does not chill, there is some other problem either with the defrost heater coils, or the thermodisk. Be advised, all that ice may overflow the pan under the unit.