What kind of thermometer and hygrometer are you using? Do you know how to calibrate the hygrometer? It's really starting to sound and look like a humidity or bacteria issue than a temp issue. With the exception of the one incubator that was swinging temps on you. I would expect that somewhere lost there. Loveourbirds, maybe you can weigh in too. You've incubated more than I have!!!
One of the thermometers came with the bator. I think it reads a couple degrees too high. Got an analog thermo/hygro set for reptile enclosures at the pet store. Tested that thermometer with one more at first and this one seems to be correct. Did the salt test with the hygrometer in the beginning and seemed to be ok. Put one more analog hygro in since and is reading the same, so hopefully both are right. It's be sad if they quit because I forget to hand wash once or twice. Definitely a possibility though.
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