Game stops after champ select (please read/help)

When I join a match and go through the Champion Selecting phase, y'know when it automatically transfers you to the actual game client after selecting a champion to where the actual game starts loading then you actually play in it? Well, sometimes the game just shuts down on it's own. Like, I'd join a game, select champion with other players, finish our part then the client just shuts down instead of transferring me to the actual game. I'm forced to be AFK and I usually get reported for that. I can't even reconnect back into the game. It won't give me the reconnect button. When I click back to the client, it says I'm still in the actual game, even though I'm not. I've tried reporting this bug many times. I also deleted the game and re-downloaded it just to see if it'll help. I don't know why this keeps happening 60% of every time I play. I'm sitting right now typing this while I just got shut down from trying to play. My teammates are probably reporting me by now. I'm set on a 10 min low priority queue for AFK-ing. I'm too afraid to play this game now. I'm scared of having the game shut down on me and not letting me play. I don't want to get reported for this, that's why I'm here. If anyone might have an idea of what's happening to my game then please tell me. I'm no computer expert. Just a guy tryna play his game.

Thanks