I couldn't tell you how many times I've bought new guns when, as it turned out, the one I had wouldn't function properly simply because it was clogged with paint. I, too, am a retired commercial painting contractor and I guess I still got that gasoline airless mentality when it comes to cleaning equipment. If I were you, before I purchased another gun, I'd double check and make sure it's spotless. That is a small hole and it doesn't take much to clog it. Then, inspect your needle/nozzle for damage before trashing it. Read up on the cleaning info posted here. These guys know the game. Unfortunately, I can't help you with that.
Good luck.