A suggestion may be what I've finally rigged up & found gives me confidence, I've used this system now for 2 years & no issues, have to say though I never had issues prior as well, but this gives me the most confidence.
I use Black Rapid Sport Straps, you can get Right or Left, I have one of each, to the end that normally screws to your camera tripod screw, I attach a RRS Quick Release Clamp, I use "Locktite" on the screw end before screwing into the Clamp, makes the connection then pretty well unscrew able (Not sure that's a real word but I'm sure you get the picture), the RRS Quick Release Clamp then Clamps to my Camera L Plate (RRS) or my Lens Foot replacement, again RRS, but you can use Wimberley Plates for a cheaper fix. System requires you to have L Plates or Wimberley Plates on all your Camera Bodies & or Lenses, any Lens/Body combination from 14mm up to 135, the Connection is to the L Plate on the body, anything from 70-200 through to my 600 the connection is via the RRS Foot replacement, although I generally don't use this system to any real degree on the 400 & 600, rather use a Monopod or Tripod with the whole Rig on a Wimberely Head.
It's not the cheapest method of peace of mind, but it works.