Hey Louis1210 understand the frustration but getting rude or dismissive won't help. What you have linked a a couple of similar issues that may or may not be the same as yours. In those you link they mention that the sound causes the game to lag which does not seem to be something you see as you've made no mention of it.
Just because someone issues sound similar does not make this the case. And the thing is, before we can escalate something to the FC team we need to gather certain information and a single report of an issue like this generally points to something system side rather than game. That you still have it when you mute all in-game sounds would point towards system rather than game.
An issue affecting a handful of people out of millions of FC players is one that we need to close off any and all other causes. Our team fully investigates reports of issues like this but from what you've posted the sound is not coming from the game as once all sound is muted nothing will output.
I'm not trying to brush you off, just setting the expectation that almost any time we see an issue like this that only affects a handful of people it's generally been found to be an issue outside of the game.
Darko