Tippmann_A5

I have had my Piranha SRT E-FORCE for 3 weeks now,it has had a few problems since I have had it, like having to change springs a few times to bring up or drop the velocity.

Today my brand new gun(used it about 8 times) kicked the bucket, I got there and my gun was rolling balls out the barrel with the stiffest spring I had I could only get it up to 205. The guy at my park tried helping me and stretched the spring that I had in there, then we tested it with his HPA tank cause it was right there so he just screwed that into my gun cause my C02 tank was about 40 feet away. The gun worked perfect with a bit of velocity adjusting the gun got to 275. Then we both thought that stretching the spring had done the trick so I screw my C02 tank in and it doesnt work, ball doesnt even come out the barrel, field stripped...nothing appeared to be wrong, so i try another c02 tank and it doesnt work either. We try the HPA again...275. The guy has a look nothing seems wrong, he said hes gonna take it home and have a look.

What could have happened did my gun aquire a taste for the high quality HPA and now it cringes upon the C02, has my gun become a snob........ .....j/k what do you seriosly think is wrong with my gun?