Get a chest by getting an S- or above.

Dear Riot The idea about the chest is that you get a chest if you earn and S- or above (S-,S,S+). If you get a chest it goes on cooldown, that means that you have to wait around 4 days or so before you can get another chest.

-The Bug- I have gotten tons of S or S- by muself or with a premade, and people on my team have also gotten S or S- without me getting a chest. I just dont receiv the Chest and the "chest timer" or the cooldown on the next chest does not begin, it tells me that If I get an S- or above by myself or with a premade or anyone on the team gets an S-, then I will Receiv the Chest, but that never happens.