Our Fridgidaire Gallery series temperature is drifting on the bottom freezer from -4 up to 17. The fresh food side is drifting from set point up to 56 degrees and it stays there for hours. I replaced the mother board but it still reflects those same number. I checked it with a thermometer and the numbers are real. The freezer started acting up first. Earlier this month the water through the door stopped flowing I by-passed the internal holding tank and got that working-don't know if the problems are related. The ice makers do work. I am puzzled. The unit is 5 years old. Model LGUB2642LF8. Any suggestions? I called the local repair shop and got no satisfaction-I didn't buy it from them.