Desync issue that makes it seem your spectating

there is a issue were if you die or a game or if the game lasts for 25:31 mins you get a huge lagg spike then desync. this effect makes the game seem like your spectating despite being a active player. you see the game 40 sec to 6 min behind real time, i have tried to use my friends screen (who is also in game) to continue playing, but on my client i appear behind. the other players on both teams just run on the spot and teleport around the map. some times players will appear walking though the walls and flying around, at the same height as the tops of the towers. if anyone else is having this issue pls leave a comment so that we bring this to riot's attention