I need help on Janna.

I am currently mastery 6 on Janna, my win rate is usually around 50%. But for the last 7 games on Janna I've only won a single game. In all the rest the enemy team won from between 24 and 35 minutes into the game. Usually wins with Janna for me will be in games well over 35 minutes. My usually build is {{item:3069}} {{item:3117}} {{item:3504}} {{item:3107}} {{item:3222}} {{item:3905}} and I usually take e or q at start of the game. Am I doing something wrong, or is matchmaking just giving me a hard time? If I'm doing something wrong please tell me what it is.
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