Star ranking. The star ranking is based on the last game round played. So if in one game round. you come in the top 100 and get a three star and for some reason in the next game round you don't make it in the top 1000 then you will not have any stars right?
Once you got in the top 100 and earned 3 stars you will keep them. Doesn't matter if you drop ranking in another round. As I still have my 1 star from the very first round.