I've had this lens for over a year. I use the Black Rapid strap, attached to the lens.
When I first got this lens, I was using the neck strap on the body, ...Big Mistake! It's a neck killer, and I think it might have caused problems with the lens itself. Putting all that stress on the camera/lens attachment may have been the source of a problem I had with the camera failing to recognize that a lens was attached. It may have been pulling the contacts apart when I walked or moved.
I should have known better, but it took a few warning messages to get me thinking about it. Since changing to the Rapid strap, no issues whatsoever.