Digitus android tv dongle not booting

[Android Question]

Hi I bought this dongle and for about 4 weeks its been working great and I love it but now it won't boot. It just sits on the start bit with the little android figure and circle swirling round. Does anyone know how I can get it to boot again. (This is the second one of these I have owned. First one lasted only a few days then died so I sent it back and recieved this replacement. I will probably send this one back too but thought if there was some easy way to fix it then that would be preferable.)

Thanks for any help.