If everything is in good shape and the bolt isn't resetting, then you have a bolt stick issue. It could be caused by a timing issue where your on-off pin is too short, or your level 10 carrier size is too small.
The high pressure and rapid firing will cause heating in the valve and could alter the tolerances a tiny bit. If you were tuned close to the edge of acceptable operation, a tiny change in the sizes due to heat expansion could cause things to be tighter than normal and not fit as well as before.
Except for the Automag in front, its usually the man behind the equipment that counts.