Hearthstone used to run fine but now drops fps mid game

Played over the summer with zero issues. Redownloaded this week and I cant play a single game without the game starting to stutter maxing out my HDD every 2 seconds after about 4 rounds. Nothing has changed on my end and its made the game unplayable. I can play other games in 4k on a 50 inch screen but cant run hearthstone in even 720p not full-screen on a regular monitor without it still lagging/dropping frames.

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