why though

So, I was playing a fairly long game. I was playing as Rengar, everything was going a-okay, until at about 50 minutes, after I finished my build, upon closing the store I was met with "attemting to reconnect" this went on for a few minutes, so I decided to leave the game and reconnect, it seemed like a good idea. But, when the client opened after I left, instead of "reconnect" the message said "exit instead". I figured i'd just log back in, so I clicked it, then opened league to log back in. "League of Legends is currently down for maintenance."