#1 What would cause a LG refrigerator to stop getting cold?
If the condenser coils are dirty, they won't dissipate the heat effectively. As debris builds up on the coils, the refrigerator becomes less efficient, causing the refrigerator to work harder to cool down. If the coils are significantly dirty, the refrigerator will not be able to maintain the proper temperature.
#2 How long does it take for a LG refrigerator to get cold after you plug it in?
It is also important to know that the inside temperature and the external settings display may vary +/- 5 degrees. If you made changes to your current settings, allow the refrigerator approximately 24 hours to stabilize. Food items blocking the air vents.