This may have been asked before but I can't find it, so apologize if it has, sds100 and BCD436hp both.. when I try to manually move between systems, some conventional some trunked, just scrolling it will lock on a trunked system with "site lock" displayed now it goes no further, just scrolls through that site. I hit Function and hit or hold dept/site button, get the message site unlocked, but it either locks up again right away, or as soon as I turn the knob it locks up again. Latest firmware. This seems like a firmware bug in these systems. any way to get it to stop locking?