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I can certainly relate to that. When I bought my cheapo LG still air bator and didn't have a clue what I was doing, I had something like an 80% hatch rate the first three batches.
It has been downhill ever since.
I read up on incubation, bought another bator with fan and turner and several thermometers (the type with relative humidity indicator and everything). Started practicing all the stuff you are supposed to do during incubation, and fretting through the entire process. Out of the last three batches, I've had a total of two hatch.
Sometimes it seems like the more I know, the harder things get.
I was getting poor hatches with a couple of Styrofoam incubators then I built the Monster Bator. That thing make my electric bill go sky high though. Now I've been steadily converting it into a "stable temp area". I found when I put the Styrofoam incubator in it that the refrigerator cabinet maintains a constant temp of 80 - 83 degrees. (I like to save electricity for the house temp and have it set for the heater to come on at 65 degrees and the A/C to come on at 83 degrees which I have found is way too much of a swing when it comes to Styrofoam incubators.) Then I have a 18 egg Marsh incubator that I use for hatching. It has a clear dome so you can easily see them hatching inside.
With this setup, I can put a few eggs at a time (think small flocks) in the Styrofoam incubator that has a auto egg turner in it and them move them to the Marsh to hatch. All of the incubators keep very constant temps and my electric bill is not noticeably higher.
So to make a long story short, maybe your room temp is swinging too much for your LG.