I've had this happen off and on, but never with quite enough regularity that it was an issue. Today it happened to me several times including the first shot of what was supposed to be a Bill Drill. It seems the thumb-knuckle of my support hand is pressing up on the slide stop and causing premature slidelock. This happens when working from a fast draw.
I've read this thread: https://pistol-forum.com/showthread....Up-Early/page3
But don't see any real solutions.
Anyone overcome this? This may kill the Beretta for me.