Disconnecting

Its so strange whenever I play late at night i disconnect at exact times, whether I'm in a game or not. Been happening since the start. Like just tonight I said id get my champs finished late night for better ping and I disconnect at exactly 2am. I go again fine and then while 3-1 up I disconnect at exactly 2:30am. This has happened to me so often that I always check the time and it always ends up being an exact time. I play rush to do evos, game could be nearly finished and boom disconnect and physical what a surprise its exactly 3am on the button. I always instantly reconnect and its never a wifi problem so there's obviously something fishy here and I would love an explanation as ive wasted so much of my time through this. Whats worse is everytime I sign straight back in, I am met with that damning disconnection warning and it couldn't be more infuriating