We were shooting our Sig P238 today and randomly the slide wouldn't go all the way forward. This happened a few times in the first 100 rounds of factory ammo but was a little worse today when I was shooting hand loads. It would stop short about 1/16 of an inch and the gun wouldn't fire but it could be easily pushed forward and then the gun would fire. The gun would then work fine for a while and then do it again. It was an extremely hot day and the gun was getting dirty. I originally used grease on the slide and wonder if I may have gotten too much on it. The handholds were the correct overall length but perhaps there was a crimp issue. It is a very accurate gun, especially with these hand loads. Any ideas?