I qualified for GS for the first time this year after many several of being a 1K. I just logged into my Marriott account today for the first time this year and saw that I had lost my Gold status I had achieved via RewardsPlus (Silver).

I went back to the RewardsPlus signup page and re-submitted my account link, but it seems like something was lost in my increase from 1K to GS. I received a "congratulations" email back in August so not sure what happened.