I am to a point where I'd like to find a tech in my area to confirm my theory that this scanner cannot squelch that dead air between transmits from the RCMP and therefore, cannot conitnue to scan unles I keep pressing scan over and over again.
Since you are talking a P25 it may have no bearing,
but;
In NB at my Mother's place, the local VHF analog repeater would stay "Open" for like five minutes after they are done talking. Then I got good enough reception to catch the PL tone.
There was still a little hang, but only for a few seconds. If you manually tuned to it there was still open dead air but the scanner would not stop on it.
What chance is there that the system for the Cowboys in your area uses the same type of setup but is now P25.
I am no expert, it just sounded familiar.