Consecutive losses can contribute to you playing worse, at least in my case. I get to a point where I want to watch my ELO score rise but don't wanna put in the effort to win, which is a horrible frame of mind to be in. If you hit a point where you're losing > 33% of your games it's time to go do something else, or build a new deck. Building a new deck will help you by forcing you to re-examine your strategy more during games.