Sorry if it's been troubleshot before but has anyone had their MWS trigger turn two-stage? It doesn't happen every time, but after the initial take up, if the trigger isn't pulled straight to the rear it almost slips a centimeter or two before reaching another wall. It doesn't happen consistently which is the main problem, as sometimes the trigger breaks normally and sometimes I get the false break and new wall which throws me off. Seems like a weak spring or a bad contact patch between something in the trigger box, any help would be appreciated before I open it up, cheers.
EDIT
Added a video to better demonstrate the problem; the first trigger pull is normal, then the second one I thought was going to be two-stage but almost slipped through with the full trigger pull, and the third stuck very firmly on the second stage.