PC crashes

Hey guys, Today i played 3 games , and 4 people had a PC crash. Let me explain what happened.

In the first game my midlane dc-ed 3-4 mins after that he came and said : WTF my pc crashed. in the 2nd game , my midlane at the start of the game dced and jungle dc-ed around 10mins(game time) ... both cameback in around 3-4 mins and both said that their pc crashed. In the 3rd game , my adc dced at 7 mins and cameback and said that his pc crashed.

I mean its possible once . but 4 times in 3 games? is there a bug going on or something? Does somebody else has a problem ? im kinda scared to play League right now , i dont want to lose or my PC to crash.