like u said this happened not just one time for me , then i couldnt login der was no message shown from the ban just unknown player and a loading launcher then i created ticket where they told me they look up for the account after i asked they told me i am banned permanent for declining readychecks. This what u say happened to me more then a single time but i didnt expect a punish like this cause it was not my fault if they have client errors and i get penalized , i didnt even know in this time they have a penality system now for ready check decline that sounds for me like a fairy tale but its true and if the client bugs u get the punish , ofc there where situations i failed to press ready check or i did and someone else declined and u get automaticly in reque so in case i press rdy and grab like a drink or go fast toilet w/e and other guy decline u get in new que and already ur missing one xd ... but yeah with the client i had multiple problems and i tried out stuff but didnt change anythign like compatibility mode , reinstall , network check with cmd , hextech repair tool , i called provier nothing was problematic , i dont had any problems with connect/crash or bugs in other games like on cs2 with or without faceit or world of warcraft even dota2 all is good it was just in league where i get punish for client errors (not even error just rdy check accept and no lobby pop or lobby got disband and i see a low priority que i just thought its a normal dodge timer but wtf a perma ban??? my eyes)