Peter,
Thanks for the feedback 
Thats why I posted this - hoping that the dev team will explain what or when the FLASH gets erased ;-)).
I suspect its some form of automatic update, as this particular photon may be running old code - there seems to be no way to find this out remotely 
- which really is a major limitation in my view…
It must be usable as it works - until something (unknown to me) wipes it again.
I currently have an auto factory default for safety but this is NOT satisfactory for a live product 
Thanks
Graham