As any online gamer knows, sometimes disconnects happen. It could be that your router hiccuped or someone accidentally unplugged the power strip where your cable modem is plugged into. Maybe your system simply crashed. Unfortunately for Overwatch players, unintentional disconnects can lead to a loss in placement ratings and a dinged skill

Source: Hot Hardware – Wrongfully Penalized Overwatch Players Await Blizzard Patch For Overzealous Competition Mode