bu genel bir problemdi, şuan için bende düzeldi kendiliğinden.
internette şöyle bir çözüm var, bir denemenizi öneririm:
"close all running apps – go into airplane mode – power off the device – power on the device – go to settings -> game center and log out of the game center. For me this was not previously accessible – disable airplane mode and enable wifi – log back into gamecenter from settings->game center"