I have a MAJOR problem/bug..

My PC (its a asus) loses connection , shuts down my pc and turns off the internet of my pc its all rare...It never happen till this update.. It loses connection in butchers bridge and summoners rift... And for some reason when my brother goes on his account it doesnt lose connection loses internet or anything! it only happens on my account!. SO annoying I even couldnt go back on my match and I had to write I Agree....SO annoying

Please help riot..

-yogosun604