Gotten 2 S ranks since last chest was available, still no chest

I checked all the requirements after getting an S on Kayle, but still I didn't get a chest. It said one was available when I hovered over her, I got a chest available last night, and I haven't been under tribunal for anything. And I own her of course. The only thing I can think of would be I got disconnected for like 10 seconds, and that may count towards the rule of, "No chests earned if you leave the game." If that's the case I am kind of upset.