Lake County is on the border of Illinois. We have mutual aid fire companies come across the border occasionally to assist. I've programmed 4 conventional frequencies from the RR Database to it's own FL. In scan mode, when it hits this FL, it locks on for 2.5 seconds to scan these 4 frequencies. To solve this I had to delete the channels and enter them manually on the radio. Is there a logical explanation? SDS200, 536HP using Sentinel