Oh my yes! Everyone eventually does unless you tie the locking pins on with some wire.
You know how they feel when you snap the pin back and forth, and it seems that they shouldn't have any problem, but imagine the forces that can be exerted on those clips when you're working in dirt, or woods and something gets pushed just right up against it. Then, they are not so strong as they feel to you, and out they come.
I've lost count of most of them I've lost, but I'll list a few for you so that you don't feel so bad.
Lost the lynch pin that hold the ROPS pin in place, twice, probably from a limb in the woods grabbing it and running away, Lost the FEL clips on tow pins, one on each side, lower, just replaced them, and lost one the first time out after replacing, lost the same pin the hitch arm that you did while I was ripping some garden spot with the boxblade, same one you have, and on and on.
When will I learn to tie them on with some wire? Usually I find one out, put another in, and tell myself I'll tie it up later when I'm finished working. I never have yet!
All of this is why I have a large bag of various pins, but the FEL lynch pins are a little different than the others and my dealer,
www.bigtractorsupply.com gave me two the other day. I should have bought a BAG of those too since it seems I'm not going to secure them on better!
Have fun chasing pins. They're are powers out there that we just don't understand at times. I think it's the aliens!
John