One bug I've noticed in the stock Motorola launcher on the Droid Maxx is when an app that you have paid for in the play store is updated, the app icon on the home screen, dock, or in a folder can be deleted after the update. It's happened numerous times to me. It's never happened with a widget, though.
Months ago I switched to nova launcher and it has never happened on nova. It may be worth looking into an alternate launcher, at least to see if it helps with the home screen problems you've reported.