Slide locking, magazine not empty.

[Bat Rastard]

My Kimber Camp Guard does this from time to time.
Suggestion?

[CurtisM]

I would review how you are holding the pistol and make sure that neither of your thumbs are causing the issue, especially during the recoil.

[The_Shadow]

Is the Slide Lock engaging into the notch?  Yes be sure that you are not placing pressure on it during recoil.  Could be magazine related.

When S&W was developing the 10XX series, they found via slow motion video the the Slide lock actually was bouncing during recoil and had made adjustments that fixed that issue.

You can with the slide off, insert a magazine and study the function with the slide stop in place as ammo is present or empty mag.