Today my RE650 suddenly dropped network and started continuously trying to restart and failing

I have added some images of the RE650 unit as it goes through its cycle and identified each image with the cycle described below

The sequence it follows after inserting into a power socket is:

1) Blue Power indicator light starts flashing [ attached image RE650_1 - it is flashing even though it looks constant in the single image ]

2) Continues to flash for approximately 20 seconds

3) Blue Power Light stops flashing and stays on for approximately further 20 seconds

4) All blue lights come on and stay on for approximately 5 seconds [Power, 2.4Ghz, 5Ghz and circular signal strength ring]  [ attached image RE650_2 ]

5) All lights go off and it restarts and follows exactly the same sequence from 1) again  [ attached image RE650_3 & RE650_4 ]

I have tried using the Power button on the side of the unit but it does not work to turn the unit off or on

I have tried using a pin in the Reset hole to reset the unit and this has no effect

Because the unit is in a continuous restart cycle, I cannot get to administer it through Tether or a browser

I am stumped !

If anybody has any ideas or experience of this behaviour I would be glad to hear it before I return it to Amazon

Cheers

Harry