Have you ever heard any radio traffic on that frequency, or just that it occasionally hangs while scaning?Well, the problem with that is that I actually want to listen to the planes using this frequency. If there is a way to eliminate the issue while still being able to pick up legitimate radio transmissions, I'd prefer to go that route first. And if I eventually realize that the scanner is stuck on the frequency, I can turn the knob and get the scanning going again, and the problem may not happen for another hour or longer. It's not sticking on the frequency every time it scans it, so a permanent lock out seems like overkill. It is an annoyance though, and I can miss transmissions on other systems when it gets stuck.
122.8MHz used to be the standard UNICOM frequency for airports without a tower. Several more channels have been added over the years, but it shouldn't be used for any other purpose.
Obviously I don't know how many uncontrolled airports are in your vacinity, but if there are none, I would again recommend you simply lockout that frequency. You won't lose any radio traffic if no one in your area uses 122.8