Help with random performance issues

For the last few days I'll be in an instance (usually savage or ultimate) and I'll have about 200fps and then it freezes and stutters suddenly and drops to 30fps according to my counter (feels like 1-2 fps) and this happens randomly. Last time it did this I had to uninstall and reinstall the game and even reset windows. I have no idea why it's happening again.

I'm running an i7 and a 3070ti and it doesn't happen with any other game. Please help