Photon setup flashing cyan with a "quick red burst" (now orange burst) [Solved]

[ScruffR]

As mentioned here (although I'm not from Particle)

Photon losts its credentials!

Just to clarify: This is a behaviour that is definetly not intended and Particle is aware of this issue and investigating cause and solution for this To keep track of this there is an open GitHub issue, so it won’t get lost, but there is no ETA for a solution This means you’d have to take precautions against brownout yourself (which would be good practice to protect your battery and avoid possible damage caused by a gone bad battery anyway).

Although I didn't have such a problem with the original Particle Power Shield.
@frlobo, have you got a link to a thread where an original Particle Power Shield did cause this behaviour?
In this case there'd need to be an issue opened on the shield hardware repo too.