It seems that the game sets the Master level of your audio to 1 once you lose connection in the menu after playing a game. I managed to replicate the bug multiple times by:
- Playing a game till the end.
- Losing connection once going into the menus and you’re forced to press the Exit button.
- Restart the game and notice your audio level is set to 1 in the options.
Not a major gamebreaking bug but it’s pretty annoying.