Light Bar Keeps on flashing blue then turns off

I turned on my controller like usual and it started of by connecting to a headset and then not and that went on for awhile but I managed to fix it, now my controller is rapidly flashing blue but mostly having the light bar off (the controller is fully charged and only thing plugged into the console/controller is the USB charger) The controller is also fully working and and having no problems other than the flashing light bar.

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