Client is Crashing/Freezing

Hi, I have been having a problem for a couple of weeks now which will cause my lol client to bug out. It normally happens in champ select and it will say that the countdown timer for one for the other players is zero and when its my turn to ban it wont let me ban a champ, it will keep me on the page where it tells you to choose what champ you want to play. Then the client will normally bug out and freeze or crash a few moments later. I can understand a game client crashing every once in awhile but I have abandoned 3 games because of this bug and still get the leaver ban. I also know this sin't an issue that is happening only for me because I have been in multiple queues with my other people who have had the same problem and again their client dies and a leaver ban is given to all of us. Just wanted to put this out there and hope the issue is resolved, thanks.