What's wrong with ranked?

I started playing this year and the oddest thing happened. I did my placements and got placed silver 2. Then i started playing seriously and eventually got gold, with a winrate of 70%. It continued till I got gold 3, but then everything changed, the games weren't normal anymore. I'm not a smurf and this is my main account, but it was like the system thought that I was one. Every game I got was a 1v5 or lose game. I had to carry every game. Until my winrate was back to 50% Why does the system punish me with bad players when I win a lot of games in a row? EDIT: The worst part is that they report me when they feed and then I just get more of them.
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