This game is nothing about skill

Get to a certain ELO and get demoted after a few days. This has happened 3 times in a row now in less than a month. Matchmaking puts me with lower players and autofills to make me lose and do it all over again. The pattern is so damn obvious, it's always arround 50 LP too. One day I go 13-1 with normal teammates and the other day I magicly lose all the games I play. It's not like a OTP suddenly becomes bad. Can't wait to play more games which are lost no matter I do.