I have a little giant incubator and when i first got it which was about 2 months ago I hatched 5 out of 6 eggs in it. I decided to get an egg turner and with its first use I just had 17 eggs not hatch. I cracked them open and all were fertile but they had stopped developing very early on. Is there a trick to using the egg turner? I noticed the heat went up from the motor on the turner but I adjusted that before i put the eggs in.