I have had my FNX-45T for a month or so and love it, but I notice occasionally when messing around with it or during reassembly the guide rod will be pulled forward slightly with the slide and come off the nub on the take down lever it locks on to. Then the take down lever will move up and down with the slide going back and forth and I have to wiggle and push in on the guide rod to get it back where it goes. Anyone else noticed this or fixed it somehow?