Your Ranked series has ended due to inactivity?

I was just playing some games today trying to climb a little and then I got into champion select and was gonna play my last promotion game for g3 and the enemy fiora didnt lock in and it just bugged out for like 30 seconds while everyone was still in the lobby and then I got kicked out. When I got back to the main page it said I was kicked out of promo for inacticity when I got into promos and played all games just that same day? Wtf is that