Do you remember that bug from a while back that permanently locked your camera? Apparently, it is still in the game. Also, there seems to be a bug that disabled the in-game sounds for the entirety of the game.
These problems are not on my side since a few of my friends are experiencing them as well, but there's a possibility they are only occurring on EUNE, because I've never experienced them on EUW.
Any chance you could look into these? I would love to give more info on how to reproduce them, but they just happen. Take for example my last game, everything was normal except that when the game finished loading I had no sounds the entire game, but my camera seems to have locked when I Alt-Tabbed.