I have a LG LFX25960st French door refrigerator. This was in a house I recently moved into, so don't know the history of it. I get an er ff error after about 6 or 7 hours after the fridge is on. Both fans in freezer are coming on and working, but after a while it all shuts down. Because the fans are coming on and staying on for while, I don't believe it is a fan issue. They turn freely when off. So, could that be the circuit board is bad? Any tips, suggestions are very welcome!