Valid point, thanks - that has helped.
It is beyond me why the camera would turn off after sometimes less than one minute though, when the standby timer was set to 3 minutes.
Thanks again, I am still trying to investigate random shutdown and startups from the camera, and it is currently connected to an AC-phone charger in my house to try and see if it runs stable.
If anyone has any recommendations to improve the stability of the camera, please let me know - I'm using a parking guard wire, and already set the cut-off voltage to the lowest (unrecommended) voltage.