Heard of this happening to the 357Sig that Shooting Times tested 5000 rounds thru. Author just gave the pin a whack with a hammer to flatten it out a bit and punched it back in. Did not have any further trouble with the pin wanting to back out. It to was happening after about 50-100 rounds once the frame had heated up. After sending it back to SA to check, they noticed that the extractor had broke off, as it was to long to begin with, but never had any problems during their testing. SA said the recoil spring was a little softer but still within accectable limits. Nice to know even with a broken extractor and softer springs, it never failed.