Tuning Impact M3 leaking air out the barrel.

Today I disassembled the entire gun, inspected, cleaned and re-lubed all the orings. I didn't see anything obvious. I put it all back together and reattached the tank. It immediately started leaking out of the barrel again. I dry fired it a few times and it slowly stopped leaking. I took it to my brothers to top off the tank and everything was holding fine. When I got home and opened the case it was leaking again. I dry fired it several times again and now it seems to be holding. I never did hear back from FX.