Failure to lauch after Champ Select

Today, out of the complete blue, my client failed to launch after I had selected a champ and the game moved to the loading screen. The pop-up client seemed to be working fine, I could get through champ select with no problems, but when champ select ended and the game client swapped to the character loading screen, instead of mocking those who loaded the game data slower than me, I got a message saying game has crashed, hit this button to try to reconnect.

It's a very odd, and quite frankly, random case. Not more than 12 hours before, I played several games with no issues whatsoever. Today, though, the only solution was to uninstall LoL, delete all game files, and reinstall. Not go to control panel uninstall either, go through all LoL files, delete after uninstalling the remainders that hang out like the fat girl at last call, then reinstall fully fresh.

Anyway, I hear off and on that it's happening to others, but searching threads I haven't run into a solution, so offering one up. I've gotten one leavebuster ban token from it already, hopefully this helps others avoid leavebuster in the future, even if they slick that stupid orange button forty or fifty times to no avail.

Edit: I really have no clue what happened. I don't use any addons, such as LoLReplay or LolInfo. The game worked perfectly fine Saturday, and Sunday absolutely would not launch. After one leavebuster report on me, doing the full reinstall has, so far after 3 ARAM's and 3 custom games, kept me going, I can hopefully say it's a fix for one specific problem. However, if it keeps happening, by all means, report to Riot bare minimum, or create more threads about the same issue, and hopefully it'll be resolved come 5.15 :D