FPS Flickers

So, I am unsure if this is a common issue, but I am just sitting in a game, no matter how much I set the graphics too my game just flickers fps, as if it couldn’t handle it, but I know it can and now all of a sudden it is using… about 80-90% of my GPU, this hasn’t happened before and I haven’t installed anything that is a bitcoin miner, so I am just curious might there be something thats wrong with my graphics settings? or

GPU - 3060 Nvidia