Suddenly Losing Games

At the start of the season I finished Bronze 5 and I've been climbing all season and I managed to get to Silver 2 with around 50 LP. Suddenly I'm really struggling to win a game I had roughly 20 more wins than loses in ranked and was really happy with the rate I was climbing and now I have more loses than wins and I've dropped to Silver 5 and I'm almost in Bronze 1. I'm not the best player and I usually wouldn't care but its all of a sudden and I have no way of explaining it? Does anybody know of any recent changes to the game that could have brought this on? At this point I'm just ready to quit the game because all my hard work has gone down the drain. I wanted to get Gold by the end of the season and was very close until this happened.
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