Match details: 10:20 is when this occurs
Type of bug: In game / possibly server
Playing the game as normal, our jungle starts pinging his ping. I started to notice some lag too at that point (my ping was 50, worse than usual, but nothing bad enough to warrant the lag I was experiencing).
As I was typing to my team to see if anyone else was lagging, the little 'reconnecting' box popped up. Reconnected, and saw the entirety of my team had also disconnected. For the next minute or so, everyone but me, the mundo, and the lee sin were constantly disconnecting and reconnecting.
Under the assumption this is a bug and not a server issue, since it didn't effect three of us after the initial disconnect.
Entire game disconnected. For the next minute or so everyone but three people in the game kept reconnecting then instantly disconnecting.