I got into Master with a 15 win streak, reached about ~200LP(60%+ winstreak), then I started getting those players that lose lane and proceed to afk splitpush one side line, every single time, but every single time. I thought SoloQ is a gamble, a matter of luck. No. It is not. If you're suddenly on a winning streak your account gets flagged to be matched with the worst dogs at your current elo. Not just me, few of my friends in Challenger encountered the same thing.