Stay calm, and don't panic. Give it a bit of time to see if it will regulate on it's own before you tinker with it. It takes a while to go back up if the bator has been opened. If it hasn't after an hour, adjust it a bit and wait again to see if it will rise. Just take your time, that is not a terribly low temp. The high temp spikes are what are more likely to kill chicks.
It was warm, but it did sit for a bit, perhaps it was not warm enough, it's been running spot on since I plugged it in. It must be something like that. I think I'll give it some time before I mess with it. 4 hours you say, hmmm, who need sleep?
Tell me about it. I was up til midnight that night just to make sure. I did wind up having to turn the temp up a smidge, but just a VERY little bit. Lockdown is funny! All that water in there messes with the temp.