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You lost compression in your gearbox. The BBS should not be piling up in your barrel like that. This means that your compression is failing and the piston is failing to push air into the barrel.
The bb's that shot once are twice is probably a fluke from the o-ring getting dry and catching something.
Even though you feel air coming out of the barrel it might not be consistent. With an empty magazine inserted, shoot 10-20 rounds in front of a free floating piece of tissue paper. The tissue should move radically and get pushed back.
If that is not the case, weve isolate the problem to the barrel and the hop up unit. Give it a good cleaning and try again if you can.
The improvement from changing BBS is negligible since the same thing happened after the first 3 shots.
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