I just got an older used R-Com 20 Pro (not USB). I am doing a test run with some chicken eggs. I tried to turn the turner off for the first 24 hours and it keeps coming back on. I am in manual mode and I press the "up" and "down" buttons at the same time. It says "off" and the display has the egg with a crack in it. However, when I check on it later, it is turning and the display has the turning egg on it. Does anybody know what am I doing wrong???