I have a gen 3 19 with about 500 rounds through it. I cleaned the weapon a few days ago, just picked it up to do some dry fire practice. I noticed the barrel wiggled more then it should and field stripped it to find the recoil spring seated on the 2nd level not the lowest. I pushed it back into the lower seat, cycled the slide a few times, stripped it and it was back in the 2nd level. What could the problem be?