I have used various BlackRapid straps for many years on most of my cameras (NOT the Leica's; the bottoms can come off too easily. I have never had a problem, but..... Today I added a battery grip to my D7100. Just for kicks and giggles, I mounted my 80-400 and hung them (over a soft pillow) by the BR strap. I made an immediate decision. There is no way I'm going to put that much weight on an assembly that is, essentially, held in place by a few 3/16 inch screws and a narrow thread 3/8 inch long machine screw. For now, my camera will be attached to an OpTech binocular harness with safety lines (probably 1/16 inch stranded wire cable secured by tension locks) from the strap lugs to the sliding loops. I will take my time exploring a replacement, but I am sure it will be based on a double shoulder harness with high test steel loops, buckles and connectors.

Just got a D500, popped in a battery, changed a few settings, took some practice shots; then headed out to my grandson's baseball game. I had the camera on a sling-type strap which was around my head and one shoulder as it should be. While I was fiddling around trying to get the blasted chair out of its bag, the camera landed in the dirt. As I stared at it in dumb disbelief, a few swear words almost exploded out of my mouth; but instead, I said, "Oh man", picked up the camera and checked for damage.

The strap was hanging useless around my body & the attachment for the tripod screw was intact. I have no idea how the camera got loose! I have used that Joby strap successfully on the D7100 for 2 years with one near drop when I first started using it (apparently the screw can loosen itself?). After that, I got in the habit of checking the security of the straps' connection to the tripod screw all the time.

The camera survived (thank you God) with only a few scratches on it and I was able to get some great pictures; but, as soon as I got home, that strap went flying!! I immediately went online to find a better strap. It turns out that most sling straps attach to the tripod screw...well screw THAT.
I took my OP strap off my Sony and put it on the LEFT strap lug of the D500; so as not to interfere when using the battery grip.

In case you were wondering, there is a question or two coming. I had the battery grip on the camera at the time of the fall.

1) Could the extra weight have been a factor?
2) Any suggestions for another strap? I looked at Peak Design, but it attaches to BOTH the strap lug AND the tripod screw.

I had ordered a Gordy wrist wrap for the D7100; but, now I will put it on the D500. Also I ordered gender switches for the OP strap so I can wear it on the other shoulder.

Thanking you all in advance!

The funny thing is... I was offered that kind of protection at a substantial discount when I bought the camera; but, I declined saying, "I never drop my camera". It might not have included theft though. That is something I WILL check out... tomorrow.

The 70-200/2.8 should be awesome at your grandson's baseball game if you can hand hold it. I had that lens and HAD to use a tripod to use it, so I sold the lens to someone younger! I will say that the D500 did not disappoint. I was considering a 200 Prime. I will try out the 70-300 at the next game.

I have two sling straps, both of which have a metal plate that attaches to the camera body via the tripod SOCKET. I've used both slings many, many times on several different DSLR'S with various sizes lenses and with speedlites, and never once has a camera unintentionally disconnected from either sling.
I don't know what kind of sling or mounting plate the OP was using when her new D500 hit the dirt but if it is anything like my slings, and many of them are very similarly designed, it sounds to me like more of a case of user error than equipment failure.
If the attaching bolt on the plate was tightly secured to the tripod socket, the camera and strap should not have separated.