I queued for two ranked games and both had the client crashing during the loading screen. For the first time I thought it was a coincidence and queued a second time after losing 18 lp in the process. The same thing happened in the second game and I don't want to queue again as I already lost 36 lp due to the client, it isn't an issue on my side as i have stable wifi atm.
Can you have a look at this, maybe your antivirus or firewall are not properly set up: https://boards.euw.leagueoflegends.com/en/c/help-support-en/JdTE2uEY-troubleshooting-crashes-after-champion-select-stuck-on-reconnect-button
You can also try this: https://support-leagueoflegends.riotgames.com/hc/en-us/articles/224826367-Automated-Troubleshooting-Hextech-Repair-Tool https://support-leagueoflegends.riotgames.com/hc/en-us/requests/new
Test in custom games alone.
