Bought a used 40VE about a year ago and it has functioned flawlessly with FMJ and HP ammo. Today, using Winchester White box, I had a consistent problem of the next round not fully going into battery. Extraction was not the problem, the fresh round just couldn't find the hole leaving the slide slightly open. I'd pull the slide rearward slightly and release it. This would snap the round into battery. In 50 rounds, this happened at least 10 times. I've used many rounds of Winchester WB and the gun was clean. Any suggestions?