Possibly, your pre-travel screw has backed out a little. When you release the trigger, does it move a little farther forward than where it is when the trigger resets? If so, the pre-travel is okay. This is easier to see with the receiver off the grip frame.
It's a hex head screw (I think 1/16th) in the front of the trigger, in front of the pivot hole. Not the most fun to get to on a factory trigger, one reason people use the VQ triggers.
It should be blue-loctited when set, so you don't have repeat of same problem. Set it, like above, so that the trigger goes a tiny bit past the "click" of the trigger resetting.