WEIRD sound issue problem

Hey lately my sound have been really weird .. it lower itself down automatic but i cant see it like in the the volume it says it "havent changed" and sometimes you higher it then ... then it comes back too normal so its like super loud its really really annyoing lol and i have no idea what the problem can be..           dont really know if i should put this in some Audio sections or here on Windows??.. anyway thanks for the help!

sounds like a faulty wire