My 436 has trouble tracking a Harris P25 system (Midland, TX) that my Pro-106 tracks with ease. It constantly misses transmissions. While scanning the favorites list that has this P25 system along with just a few small conventional sublists, the radio doesn't show any signal bars when it scans through the P25 system. If I do a hold on the system, full signal bars will show here and there, but they are absent for the most part. I'm well within the coverage area, so signal strength isn't an issue. I've played with some settings, but no luck yet. I'm at a loss. Any ideas?