I suspect your compressor is the problem,
if its similar to the one pictured below then your max pressure will be around the 15psi. which will be less than that once you push for air. which means it cant get enough pressure happening to clear the paint properly through the gun, so you get a build up inside which eventually chokes it.
15psi is normally the maximum for detail work and the paint (createx illustration) is normally heavily reduced (1 paint: 10+reducer)
if you watch some you tube videos of the Pro's at work you'll notice they often blast spray off to the side.... its because they're getting a build up of tip dry or the paint is starting to clog.
You will either need to reduce your paint a LOT more or bite the bullet and get a mini compressor with a tank that can deliver at least 50psi - because when you push the air on the brush you will notice the regulator drop by around 10psi or more.
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