Client Crash Face Possible Ban

I am having random client crashes from time to time. I have already reinstalled several times and nothing seems to fix the issue. The Client has crashed while is champion select as well. I am worried that this issue is going to get my account banned. Which has been active since closed beta. Is there anything that can be done to help me? It only crashes one time when I load the client. After that it seems to become stable. But it is hard to tell exactly when it will crash. MOST of the time though, it is during client select. PLEASE RIOT!!!!!!!