My freezer is freezing like it should. The fridge however is warm. What would be the problem?

Fan between freezer and refrigerator compartments might be stopped.. Try to turn the blade with your finger.. Or it's possible the defrost heating element might be bad..

fridge to warm? check thermistor, the cold control ( sometimes called defrost timer) and the air control assembly, check to see if air control is to far closed or opened? the inlet to the fridge from freezer. sometimes a bad defrost terminator will hinder the air flow and freeze up the fan from operating and freezer section thus no air flow to the fridge..

Your t'stat is probably bad. Should be easy to fix. At least it is freezing and not ruining your food from being too warm.

The fluxating temps bottom to top and top to bottom freezing are a result of the "air damper and baffle assy" not functioning properly. I would attempt fo make my case with LG that this started while the unit was under full warranty and persists today.

Behind the back wall of the freezer about halfway down, probably behind the light bulb (if there is one there) there is a fan. My guess is that the fan isn't working, or is slow. To test, open the freezer door, then hold the door switch closed and listen for the fan.

This fan should be blowing air up the back of the freezer, and send some of the cold air through a vent at the top of the freezer into the fridge. The air then descends through the fridge and reenters the freezer through a vent at the bottom. If the fan is broken, or if the upper vent is somehow blocked or broken, the cold air will enter (rather than exit) the fridge side at the bottom vent. Because cold air tends to descend and warm air rises, the cold air will freeze the stuff at the bottom of the fridge, and the thermostat (at the top of the fridge) will say it is warm.

check your defrost system

bad evaporator fan and or a defrost problem

Is this a self defrost model? Frost inside the freezer could be an air leak around the door gasket. Remove the back panel in the freezer and completely defrost the coils. Is the fan running in the freezer. That will make the frig not be cool. With the door closed peek in the gasket to make sure the light is shutting off, this will warm a frig also.
Eric

The defrost thermostat on the defrost heater is probably bad, it's a good place too start.

On a fridge freezer only the fridge temperature is monitored. In a cold location the fridge might not even need cooling and the freezer would get too warm but the thing won't care.

If the fridge sensor sees it as too warm then it will keep the motor running and the first thing to get really cold is the freezer.

Remember the freezing part is not temperature controlled ion a fridgefreezer.