Ring Doorbell Gen 2 Takes A Long Time Before It Can Be Pressed Again

Hi.  I have a Ring Doorbell Gen 2 and a Doorbell Pro. The Gen2 doorbell has started to take between 30 seconds and a minute before it can be pressed again, whilst the Pro takes about 10 seconds or so.   When the Gen 2 bell is pressed it rings the chime as expected and the blue light spins, (just as does the Pro, but that then gone out), but after about 10 seconds the blue lights change to on permanently for another 10 to 15 seconds, sometimes more, before returning to spinning blue and finally going out.