I have two Pro-197 scanners set up identically with all updates and frequencies. One of the radios is now stopping on two conventional frequencies when no transmission is being made and the squelch is open as if turned all the way counter clockwise although it is not. Turning the squelch control clockwise makes no difference and the only way to resume scanning is locking out the frequency. The two frequencies that this occurs on have no CTCSS and the display says search. I am assuming this is a mechanical problem with the squelch control but am curious if any others have experienced this problem and if there is a easy fix. Thanks