Been having issues with FPS drop lately and game crashing and freezing machine with black screen?

As the title says, i have done the whole trouble shooting process, drivers, firewall, graphics, permissions as stated in the guide posted directly from Riot. iI keep q'ing for ranked games and this has been happening lately has never been an issue on my computer before, i am some what frustrated because i am writing this after 2 crashes in a row my acc is currently in a ranked as i type this. I dont know what else to try