LG Electrocool Refrigerator - working but backside very hot.

We unplugged and cleaned out our refrigerator today, it was unplugged for about 1 hour.  After plugging it back in, it started working fine, however the back of the refrigerator is very hot, along with some areas on the sides.  The air is flowing from the freezer down to the refrigerator compartment, and the freezer is cold as normal, but the frige feels slightly warmer (due to the heat on the outside of the frige I believe).  I never noticed a fan on the bottom working before so don't know if it stopped, no air is being blown out from the bottom though, but we hear the fan running on the inside and can feel the air blowing inside the freezer (even when activating the button like the door is closed etc.  Finally if I unplug the unit even for a minute and plug it back in, then it will go cool like normal for about 15 minutes, but then starts to heat up again.  The unit is just about 1 year old.