Please post your dmesg. If you don't know what it is or how to get it please search the internet.
Tell the list how the /home/media is mounted. Again , if you don;t know how ... search the internet. If you are using some configuration options inside a file for mpv please list them here. I don't think someone on this list is an expert in paranormal nor telepathy guessing and even there is someone it won't be for free :) .
