Possible Sound Bug

So today i started a ranked game, got through champ select and then got into loading screen. As always, during loading screen i alt+tab out and go on Youtube and watch some videos before the game starts. Then when i hear the noise of the champs spawning i go back in game ready to play. For some stupid reason my game became muted and i didn't hear the game start, my team remade now i have a LeaverBuster. This had happened to me twice before but i fixed by just muting everything in options and then unmuting it again, it worked but this happened again. I know for a fact they aren't going to remove my LeaverBuster but If this is happening to anyone else please share it so we can get it out to the riot employees ty.