With that out of the way, I would guess extractor tension.
My SR1911 had similar issues and that was the diagnosis. The gunsmith onsite at my range fixed in about 6 minutes and did not charge me a dime.
I had the slide off the gun when I took it in and he popped the extractor out and bent it a little. The gun has run like a champ since then. I hope you have good luck. My feel is I would let a local smith look at it before I went through the trouble sending it back.