Actually Larry, if that migration to P25 is fairly recent, there might be a better explanation. It's been noted in several other places that new systems tend to restructure and realign their antennas to concentrate coverage inside their target area, and reduce it in the outlying ones. About 2 years ago, Philadelphia did this as a prime example, and the poor folks there are still dealing with this. My own home (Prince George's county in Maryland) did this with their Phase 2 system that went online about the same time Philly was making their changes, and had a similar result.
The official (??) argument (yeah, right) was this was intended to reduce co channel interference, but who's buying that one.
Of course simulcast distortion issues have been plaguing us for years now - and scanner manufacturers have yet to catch up
Mike