I had to change the weather scan interval to a higher setting (250 x100 mS) to keep it from checking for weather alerts to often. It also would cut to this while people were talking.
It is on the weather tab in the Win 500 program.
You can't change the scan speed at all. Missing the beginning of transmissions is normal, as you have a scanner which may have 1800 objects to scan, other objects could be active, and the radio will be scanning for the next active object and you will miss bits of transmissions.