AIr Head

This seems to be a stupid question since I've been airbrushing for years, but I've run into a snag lately. I usually use a dual action airbrush for about 60% of my work, I use a Badger 200 single-action for large scale coverage, but lately the Badger has been a little finicky. I'm not getting very good flow, and a good deal of clumping on the tip. When I do get it working there is very little adjustment available between no flow and the kind of spray that needs to be 8 feet away to prevent running. Once I do get a decent spray, I get two or three passes before I lose paint all together and have to do the adjustment dance all over again. I've been using the same combo of paint and thinner that I've been using for years so I don't think that's the problem, but I would welcome anyone's recommendations to keep me from throwing this thing out the window.