major bug I cant explain it

playing an akali game relax, then suddendly everything disapeared. Not a black screen I could go across the map with my mouse but the minimap disapeared, my items disapeared, my abilities too and the timer on top right (all the boxes and boards). I jsut could press q-w-e-r-d-f or b, pings were uneffectives. Couldnt open shop neither press esc to elave game I had to alt-tab and close league to reset it... When I came back it was fixed but ocne the game ended league closed by itself

The only thing I see is an hack/exploit because we were starting to destroy enemy team (as I hit lvl 11 and made a triple kill on the enemy)