Well, it's been a while, but I was out flying 2 days ago and, lo and behold! There's the "missing" aircraft. Very strange behavior. Pleasing, but strange...
It might also have something to do with the fact that you have 4 ADSb towers within 5 miles of your airport. I have noticed that on your ADSb Log that a lot of the aircraft targets were ghosted with double images. I'm thinking that your Stratux is picking up the same target from 2+ different Towers and then your iFly is trying to display the targets from 2 different sources, but the programming of the iFly is then filtering out ghost target images and not displaying anything.