league of legends randomly freezing/white screen

league client is honestly bullshit. I've reinstalled the patches, restarted my computer, set the priority to normal And yet my client freezes whenever i get into a champion select and i can't do anything. I have to use Task manager to close the client. It either freezes or it white screens. Pls riot fix your shit & i know it's not just me it happens to my friends all the time. oh by the way had to dodge 2 ranked games due to that and that's very frustrating.