Game Client for Ranked

There is seriously something wrong with the client. My normals games were completely fine and so was aram. But when I started a ranked game.. it went downhill. First 3 min or so was fine then all of a sudden my game froze and just stopped responding. I thought something happened to my internet, went and checked it and everything was fine. Internet was up and working. Ms and ping was perfectly normal. I closed by client and reconnected. I was in for about 20 sec and it happened again. Rejoined again and it wasn't even for 10 sec and the game stops responding a 3rd time. No dc no nothing. Game just stops responding and nothing moves. We lost before 15min. There is something wrong with it or something. Would love a loss prevention.. cause this was just nonsense.. If I won that I would've been in my promos.