Reading through the User Guide, it struck me that setting Power Off for the nightime hours might save a bit of battery, so I found the relevant Setting and tried to adjust it to my liking.
However, in whatever way I try to input a new value, when I go back up to the "Schedule power on & off" screen the times are back to their original "7:00 AM" and "8:30 AM" somewhat useless settings!
Do others see this, or am I being stupid somehow?