Hi Robert,
It's probably a couple of things. One if you're near a cell tower it can have a devastating impact on how well you receive the signal. Secondly, their system is getting old. I've heard officers and dispatchers commenting on how bad it's getting so it's not just us scanner nuts who are having issues. Thirdly they are in the process of going to MARCS-IP. There are already patched talkgroups for Patrol 1, 2, and 3. How soon they will be full time on MARCS-IP is still up in the air as far as I know but the wheels are already in motion.