Riot's client crashed and cost me a series game
The at least 100th time my client crashed out of nowhere for no reason while I was in my series proving that Riot programmers are completely incompetent and that the entire ranking system is completely inaccurate. Who knows, now I have to assume people got to challenger because 90% of their opponents have an afk from league's client crashing and don't actually have any skill. Since they can't hire one competent programmer there's no way of proving anything is accurate.