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But maybe try uninstalling it and reinstalling the entire unit, inspect all the O- Rings for cracks or chips, as the slightest air pressure problem could ruin it as well.

I think Mosin hit the nail on the head with this, I had the same problem and it turned out to be I was using too short of a nozzle. Also, do you still have the little spring that you put on top of the adjustment arms? That spring plays a lot into hopup consistency with PDI's hopups.