M.2 Drive Acting Really Strange, Please Help!

So I have a western digital back 1TB m.2

(WDS100T3XHC) and it's really playing up and I'm getting so confused!

Sometimes whilst just using the drive and editing with DaVinci my media will slowly start to go offline... a restart will fix this but sometimes on restart the drive will be visible and I can see the first layer of folders but when clicking one it pops up with an error message along the lines of "selected folder dose not exist"

It's also really slow when loading some folders even when containing less than a GB of data! I'm on windows 11! Any help would be greatly appreciated!

Thank you