It's funny that you mention this because I have noticed the same. We have painted in the house the last few days and thought maybe the fumes were making the skimmer go crazy, but it has been much more humid and hotter than it has been, so maybe that is the culprit. My skimmer is in the basement, but it has definately been warmer and more humid down there the last few days.
Basically, I had to drop my water level in the skimmer about 3-4" and reduce the air intake about 2 full turns (on both injectors) to keep the skimmer running good. If I left it running where it has been, it would fill the 5 gal. waste collector in a couple of hours.