Client keeps crashing when going into champ select.

Recently, every few games, when i go into champ select, my client either just flat out disappears, but its still running in the background, or the client just is like "Fuck you and your LP" and gives me a message saying something like "Your LoL Client has stopped working" and it closes. So now I lost LP, I have a long leaver, and my client is fucked. I hope this isnt a problem with the new client too, but can anyone help?