Well, my wife would say (if I told her about this thread) that I'd jinxed myself.
After several weeks of carrying the Long Slide as I go around doing all kinds of stuff around my home/property it happened today. Twice.
This time of the year I open carry around my property. A jacket adds another layer to move out of the way to get to a pistol carried IWB so I use a drop leg holster for open carry.
I was standing in the yard, I'd let the dogs out of the pen and they were doing the things dogs do and I was watching them and petting them. I happened to look down and see the magazine partly protruding from the pistol. I smacked it back in, wondered (very short time) what had happened, thought about this thread and went on.
An hour or so later I was working on a shelf for the new shed. I was up, down, gathering materials, tools, carrying stuff to the porch, measuring, cutting boards, screwing and nailing pieces together and went into the shed to get the little compressor so I could use the air nailer for some thin boards I wanted to attach to the shelves to keep stuff from being pushed off the shelf. Got inside, bent down to grab the compressor and decided to do a practice draw from an awkward position. Pistol felt funny. Took a look and no magazine in the pistol. Walked outside and it was lying in the chair where I was sitting as I attached the legs to the shelf.
Again, no idea what happened (I'm wondering if moving forward/barckwards in the chair is causing the right side mag. release button to hit the chair/arm frame tubing (folding chair on the porch). Not 100% sure. Decided to grab the M&P 2.0 5" and carry it the rest of the day till I can do some more testing/trialing and determine if it's contact with the chair frame tubing, or something else.
So, there it is, from "it never happened to me" to twice in one day inside of a week.