i saw this on another thread from a few years ago but i assume we are experiencing the same problem
"No need to restart comps, recheck firewalls or perform late night surgery on your laptop; skipping stats atm will almost certainly ghost your game (not doing so means your game is ghosted anyways, lose-lose situation). For those who have never been ghosted, it basically means the server just was hit by sudden Alzheimer's and forgot to follow up on the termination of your game. It may take a few hours (often several) for you to unghost, so in the mean time, go play your other favourite games, go out, or if it's 1 AM, go to bed. The ghost games and server issues will probably be resolved shortly (or maybe longer; none of us are Rito so it's up to them)."
link: http://forums.na.leagueoflegends.com/board/showthread.php?t=3576328&page=5