I'm in Washington Co. I also have the 325p2. Everything in the database is correct as far as I have tested. The signal flicking in and out is a mystery I'm still trying to solve. It happens to me on both the scanner, and my SDR. No clue why. I have an antenna I'm going to test in the coming weeks, but I doubt there will be a difference. If you need help programming it, just shoot me a message. I'm just north of Hagerstown.
One thing to note, the FD isn't too active. Most of the time, I only hear about a call an hour, sometimes more. There are some nearby systems you may be interested in. Mainly the surrounding counties in WV, VA, and PA. There was a bad accident with 1 fatality last week on 81 in PA and I heard every minute of it with the stock antenna. MSP is pretty active on MDFiRST. Those guys like to joke around so it's always a good listen.
Here's what I have on my 325p2, aside from washington co:
Franklin Co, PA - Fairly active. Strong signal. I only have the Mount Quirak site programmed in.
Adams Co, PA - East site gives me a good signal, West doesn't. Regardless they have their share of activity. Also a strong signal
Fredrick Co, MD - For me, it depends on the day. Some days it's strong, other days it's pretty weak. With 70 and 270, it can be pretty interesting with accidents.
MDFiRST - I have it limited to MSP, and it comes in quite good. The most activity I get from it is MSP Hagerstown and Westminster.
WVSIRN - I have it limited to Berkley, Morgan, and Jefferson Co. Pretty active and a nice clear signal
As said, I'll be glad to help you out programming it. Just shoot me a message sometime