Crash or Freeze

Dear,Riot can u please fix this game?For Second Time I have Leaver Buster because the game crashed when i Alt+Tab to start my playlist..When I click to go back in game,the game freeze and stop workin.And No its not my computer bad,Those buggs are bad because you can't fix it...I make the steps correctly for repair or unistall and install the game..Still don't work..If you can clear this Buster,please clear it..I don't deserve to have it..Its second or third time when the game freeze or crashed. Ty for the attention,bye