In my case at least, it appears to be related to grip. I haven't had a mag drop since I started working on changing my grip. I have now done a lot more shooting with the new grip as well as a new stance and have not had any of the problems I was having before, including mag drops. No more failures to feed or slide problems. It all seems to have to do with recoil management.

I never had a grip problem before, but I never had such a small and light .45 either. I think the gun requires a different grip than what had been working fine for me with other guns.

This may not be case for everybody, but it sure is having a big effect for me.