Disconnects and Game Crashes

Just played a game in ranked. I was disconnected at least 6 times during the game costing my team to lose. The majority of the time I was disconnected from the game is was then able to quickly rejoin the game through the normal loading screens. Twice after the disconnects I was unable to rejoin quickly and was given a message stating that the game had crashed. I am fairly certain that the issue is not my internet connection or my computer. The reason I am certain the issue is not my internet is that I am able to play Diablo 3 on highest graphics settings without any lag or disconnects. I'm not sure why I am continually being disconnected or why I am getting the game crash messages. I thought I should bring this to riot's attention in case I am correct that the issue is on their side rather than my own.