We just lost our 4th clutch of eggs! We have a Brower Top Hatch and although the temp has always remained steady and humidity seems good I do not understand why we are losing our chicks. They seem to all fully develop and never pip. We have tried extra humidity with sponges and water, we have tried dry hatching (we got one using that method). Is this incubator a total dud? We've had it over a year.