I have a GE refrigerator bottom freezer. Model: PFS22MISBBB A few days ago we saw that the freezer was not cool. I tried lowering the temperature to see if that would work but it didn't. Then the refrigerator stopped working. I then unplugged the refrigerator from the wall and plugged it back in. After a day both were cooling like they should but then today the freezer stopped cooling. What could be going on?