Been having some issues with my P938. Twice in 2 days the slide stop pin just fell out. This happened in the unloading process, after dropping the magazine then racking the slide (thumb safety on/up) to clear the chamber - slide stop pin just fell into mu lap. Later that same day the second issue happened at the range during a re-qualification class, I was only getting 4 shots out of a magazine loaded with 5 cartridges. Slide locked back fine. No cartridges left in the magazine. Thought I was going crazy but it happened with 3 out of 4 magazines loaded with 5 each. Pretty unnerving during a class. Any thoughts out there would be appreciated!