Game keeps minimizing itself

My game keeps minimizing itself to the taskbar while I'm ingame. It does this during summoner's rift, odyssey and it did it on nexus blitz as well. This happens completely randomly, sometimes it happens only once a game and sometimes it's every 5 minutes. I honestly can't tell if it's a problem with League or a problem with my computer, but I haven't really found any reason for my computer to do this with just League as no other game/app gets minimized like this.