Not fully booting/rebooting after 1 minute

Hi,

My device has power, well only for maybe 1 munitue then it reboots, the reboot is very quick, the power off portion is a split second as the light does not turn off for any priod of time

The reason I know its a reboot as the light flash is not at the right interval when the reboot occurs.

If I plug the device in it flashed white perminently, Ive left it switched on for a couple of days and never goes to any other light

Ive held the play/pause button, I get the flashing orange light but only for a souple of seconds until the device reboots and goes either back to a flashing white or if i keep holding the play/pause a flashing orange.

I am trrying to work out if it is the software rebooting it or a power issue, can anyone reccoment any tests/test points I can check