I define a failure as the inability to immediately clear the malfunction and continue the engagement/course of fire. I have experienced one malfunction which resulted in not completing the engagement.
It was a DW 15. The metal spacer on the combat grips was missing. the wood of the grips compressed and allowed the grip retaining screw to move up into the trigger mechanism and lock the gun up.
When I shot the 5th army combat matches in the late 70s, the part of the Barrel bushing which retains the recoil buffer spring snapped off. The spring went down range and the weapon would lock to the rear. I simply slapped the slide with the heel of my weak hand and completed that stage of the course.