I CAN't CONNECT TO GAME CENTER?

My iphone is iPhone6plus and i didn't use it for a month, then when i opened my phone i saw that I can't connect to Game Center anymore.

Try to reset your device. This won't delete your data stored on this device.

Press and hold the Sleep/Wake button
Press and hold on the Home button
Keep holding both buttons until the display turns off and back on with Apple logo on it.

Alternatively, you may go to Settings - General - Reset - Reset All Settings

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