I'm wondering what the problem with my XD 45 ACP Service could be. The brass is ejecting fine, but I'm getting occasional "nose down" jams of bullets in the mag, which keeps the slide almost all the way open. It's a real easy thing to clear it. I just pull back slightly on the slide and release it and the bullet loads, and firing continues as normal. I wonder if the magazine springs are losing the ability to keep the bullets pushed up properly because it usually happens toward the last few bullets (I keep the mags full all the time). I don't know, maybe the recoil spring has a problem and the slide is not coming back forcefully enough. I've had three brands of ammo jam in this way. It's happened the first time with Golden Sabre, then with Fiocci, then with WWB. The gun worked fine for quite a while, and has only had this problem in the last 100 rounds (700+ through total).