YES!
Mine occurred more often after about 100-150 rounds through. I always load with the slide open, I adjusted my grip to make sure I wasn't hitting the release and I also shot one-handed. Now I get the mag-drop on every single shot with the extended clip now. Mostly with full mag and +1. Exactly as on the YouTube vid. Didn't at first.

Called S&W and they are actually shipping my gun back rather than send the part. The Cust. Serv. person (Jeff) said he only heard about it one other time. I called back twice and got the same person on the phone, so don't think they have a huge staff. Perhaps I am wrong, but in either case I find it hard to believe that S&W doesn't know about this issue.

Great to read that others are not having the same issue. Gives me more confidence in the weapon, but I gotta say the problem really gave me some serious doubt. Simply can't/won't use the weapon as-is.

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G19, Shield40, BG380