No keys for four days, bug or just unlucky?

So I got the asinine idea to play ARAM nonstop until I got a key fragment. That was four days ago. I don't know what the exact numbers are but I would think that at SOME point I would have gotten just one. Granted, not all games were wins but still, enough were where I'm extremely surprised that I haven't gotten any. I mean, I've gotten two fragments two games in a row before. This seems a bit extreme.