Client keeps crashing and freezing during chamionp select, and i get a bugsplat everytime i reloggin

i have been getting this problem ever since the new patch was updated, I have lost almost 100 lp and have gotten many bans, i have checked my internet and my computer and no problem was discovered, this is really frusrating, iit's ruining my game experience and wasting my time. i hope riot can work to fix this problem, because from what i have known this has been happening to many people including my friends. :(