Search your model and check if it is a “shingle” storage. Mine is, and it uses a method to write data that is slow and can appear damaged.
If it is, and you have been writing and deleting content, it can become slow. I use this for pure storage and it works fine. No deleting stuff though.
I avoid this tech on new drives, as it is very slow.
Good luck
I was going to say the same thing.