Same exact problems here. This arose right after the Sona patch. It is not an FPS loss, it is definitely packet loss. Two of us in my household have been playing for months with not one issue. Now suddenly, the game is virtually unplayable. Both computers are hardwired into the router. Both computers can browse webpages with no hiccups. Yet both computers will experience TREMENDOUS packet loss in game during very VERY inopportune times. I went so far as to replace my modem, but still the challenge presents itself. I guess I can replace my router as well but it just seems so frivolous considering everything else works great except League of Legends. I've been complaining about this issue since the week that Sona was released.