I have a two month old PT92 in 9mm with maybe 250-300 rounds through it. Over the weekend, the slide failed to completely close three or four times - out of maybe 75 rounds or so. It would feed a new round but stop with something like an eigth of an inch or so from being completely closed. Of course (thank goodness) it will not fire like that. Usually I could close it with pressure from both thumbs. Once I had to give it a little tap with the butt of another pistol. The gun had been cleaned with CLP Break Free, wiped down, followed by a thin coat of Hoppe's gun oil. What can I try now to get more reliability in this handgun?