I have a springfield stainless longslide loaded that I bought new several months ago and only have a few hundred rounds thru. I find that some times the slide will not lock back on the last round. The fault is not how I a am holding the gun I know. I have never had this trouble with other guns or other 1911's . Should I consider sending it in or just keep putting rounds thru it hoping it will break in. I have it completely stock and have had the trouble with 2 kinds of factory 230 grain hardball. I used blazer and winchester white box and federal american eagle red box. These are 3 cheap practice loads that I have never had trouble with. The gun has been cleaned well and well lubed between range trips. The problem seems to occur after the first few mags , then dissapears after maybe 60 or 75 rounds again ????