Frequent Client Crashes

I made a post about this a few days ago that was pretty snarky because I was mad but I would like to clarify what bugs I'm getting and what I've done to fix them. It started with the new client patch that made it so that my login attempts would fail even though my information was correct. I had to log out and re-enter my info more than once but that seems to be fixed now. Then, the game started crashing. In my last games (some ranked, some norms, 1 custom I did by myself to test) the game would crash within 3 minutes of the game clock starting. This wasn't a normal crash either, I would have to sign out of my computer and sign back in because it completely locked out the screen and I couldn't access the task manager. I've tried a multitude of things to fix this issue. I've lowered my graphics settings, messed with resolutions, tried running the game in various compatibility modes, running the game as an administrator, doing a repair sequence on game files with windows, doing a repair sequence on game files through Riot, and uninstalling and re-installing the game to my computer. Nothing has worked. I'm getting frustrated with the continued crashes and am not sure what I should do next. Is there anything else I could try to get the client to stop crashing, or maybe download an older version of the client to see if it's a computer issue and not a software issue. Thanks!