First, let me say that I really didn't drop it, it came off of my lens and fell. 
I have a problem... I have a 1D mkIV, 400mm f2.8 lens, Canon 1.4, 2.0 vIII converters, and a Lens Coat.
After my camera drop, of course I am paranoid, thinking that won't happen again, but I almost lost my new 7D mkII replacement the same way!
Now, I know, you're thinking that I did something stupid, but I can (almost) say without a doubt that I didn't, at least the last 3 times that I either did lose it, or almost lost it.
I was in my kayak twice last year and picked up my 1D and 400mm to shoot, and the camera fell off in my hand, another time that same day, the same happened, but I was getting out of my kayak and it fell off into my hand... (Thank God!) I was out shooting last week with a friend and it happened to me 3 times, and it's happened more than that in-between all of that time.
Here's what is weird, I sometimes use my 1D with the converter, and sometimes I don't, but that was my main camera and lens, but now that I have a new camera, it does it too, or, the lens does it too, whatever... The weird part is, with all of the different ways I can connect them together, it does it, so the ONLY logical remaining thing is me.
Like I said though, I check my camera, a LOT, one time is all it takes to crash and kill it, and I know that, and I was paranoid after the first incident, and I try my best to keep my hands away from all of that.
It has happened while it was on a tripod standing in front of me, (when I went to grab it) it's happened when I have carried it on my tripod, trying to carefully NOT do that. It's happened while I was hand-holding it too, any combination of things, it has happened, it's only actually fell on the ground that one fatal time. It's crazy, and I know the only thing it could really be is me, but I am pretty sure it's not, but that doesn't make it true, no matter how careful I am, I guess.
That button that you use to remove the lenses is fine on all of the stuff, and there's more than one, so it can't be just that. I try my best to avoid that area, especially after the fact, but still, it happens. I was walking a few miles when it fell and crashed, I had been on grass for most of the way, then I walked onto the concrete, then it happened. I was VERY conscience of that area, you could say I was babying it out of fear. Matter of fact, just not 2 minutes before it fell, I thought to myself, I need to get back on the grass, I swear, then it of course fell. (I have a foot problem, Plantars Fasciitus, so I try not to walk on uneven ground, hence my walking the concrete, sloped areas really kill my foot)
Yes, my lens has some play when I attach it to my camera, it's been that way since the beginning, but, I barely have any slack at all when I connect my 7D mkII to my 400mm lens.
I was just trying to think, has this happened to me while it was attached to my Tamron 150-600mm, and to be honest, I can't say, I don't think...
Really, I'm trying to see if ANYONE out there has had this happen to them a few times, trying to put it to where it can make some sense out of this. I'm not a newbie at all, and really, this only started back in around June of last year, that was my kayak trip, so... When this last it fell, of course, it fell on concrete, and I am NEVER on concrete with my equipment, never, but of course, that's the way it goes. heheh
Honestly, I don't mind the blame being on me, I'm not saying I don't think that it's me because trying to hide the fact.
I am just trying to see if this has happened to anyone else, and if it has, PLEASE tell me how it happened, and if you know, how it was caused, and of course, how to stop it from happening.
To help prevent this again, I am starting to use my Black Rapid Strap on my camera, so if it does fall, it'll dangle. 
The GOOD NEWS is, had this not happened, I would now not be the owner of a new 7D mkII, I really do love this camera, I might even love it more than I do my 1D mkIV, maybe.
1D mkIV
400mm f2.8 lens
Canon 1.4
2.0 vIII converters
Lens Coat
7D mkII
Thanks for looking, and I am sorry I was so long in telling my saga! 
Randy
I replaced it with a 10-22 lens, and keep it in a bag.


