Well, I don't really know if it's the fov, as I meant that it is like a blur fov like bug. I haven't changed the fov. I'll see if turning it off won't cause the bug. I'll also try to create a video if the problem appears. It just happened again some minutes ago.
Thanks for the help and tips, I didn't know I had to report one bug per ticket as I'm pretty new to this page, So thanks for telling me as well.