Ring Doorbell 3 not working just flashing when I replace the battery

So my doorbell 3 has stopped working. Took out the battery charged it fully then put it back. All I get is the blue light flash about 8 times then just does nothing else, can’t press the button etc, also when you put the battery back in it normally tells you it’s activating but as I said it just flash’s the blue light. Help please. Ok just checked and can see outside via the camera so it’s the doorbell that’s stopped working if you press the button there’s nothing.