Sorry for the issue; I just saw your post this morning. I had an issue with one of the UHF frequencies that kept locking on due to a squelch issue. I adjusted it to hopefully avoid that problem, so it should be fixed for now.
You may also occasionally hear a transmission from St. Louis Departure. There is a known frequency bleedover issue near the west end of the airport, and I live about 4 miles southwest, so I get part of that bleedover on one of the frequencies.
I'm on Twitter @jeremyhoward, so if you happen to hear any issues, please let me know. I have another guy in STL that listens a lot and lets me know when problems show up apart from my receiving general up/down network status e-mails. If the power goes out at my house, the scanner will restart but automatically starts scanning everything instead of just my presets, so I do have to manually reset it in that instance.