I just picked up new 9mm Shield PC compact and have fired it on 3 diff occasions. In all 3 times out, I am experiencing an intermittent issue where I fire a round but the trigger doesn't seem to reset. Pressing the trigger goes all the way to wall. On the first 2 outings, I would rack a round (ejecting the chambered round) and sometimes that next round fires, sometimes it takes a 2nd racking for the next round to fire. Then yesterday, it did it again but this time, I notice the slide was not fully flush to the lower. It was like 1 or 2 mm back. Again, the trigger presses all the way to the wall (there was not the 1st break, the trigger pressed all the way to the end). Then I REMOVED the magazine and the trigger then feels as it should and fires a round. I am using the factory magazines. Any idea?