Critical Error

Whenever i try to play a match, i either enter the loading screen before the game begins and it freezes somewhere around 50% and i need to restart my PC or it sends me to my desktop and it shows me an error window saying a critical error has occured. It then proceeds to make an error log or something like that and i still can't enter the match after restarting my PC, not even after reinstalling the game. Then i get banned for 20 mins for 5 games and it ruins the fun. Before the ban even runs out, this thing happens again and i am constantly banned pretty much. I don't know why this is happening because i have good internet and my PC specs are better than the recommended ones to play league. I am really considering to give up on this game if you guys don't fix this issue. I tried using solutions off the internet but they still didn't work. I used to enjoy this game until the past few days when this started to happen frequently, it used to happen before but like once in 4 days and it wasn't so annoying now i can't even play a game. I was so excited to try out new champions and the game doesn't let me. Please guys fix this quick, i know you are preparing a big update in 9.17 but you could delay it and look further into this issue. Thanks in advance!