Moving over from Hyatt this year and generally enjoying my Marriott experience.

I've had two stay posting errors in my favor already. Both involve "extra" nights being credited for a stay. One actually credited as a separate stay with a moderately substantial quantity of points (about 5000) that were not earned. The other involved a two night stay crediting at three nights.

I'm wondering how common this is. I'm also wondering what peoples' experiences have been bringing these sorts of errors to Marriott's attention (which is what I am inclined to do).

Thanks!