Started up a blind scan on my Fortec Mercury II beginning at 11700 and ending at 12200. For some strange reason, shortly after it began scanning, it found a 12144 frequency. I turned off the receiver, unplugged from the power and just let the unpowered receiver sit there for a couple minutes. After powering up again and doing another blind scan, the same problem recurred. Know of any solutions or why this might be happening?