Although I cannot tie the change to any particular event, my TomTom Go Live 1005 no longer runs down when external power is lost, whether that is when the ignition is switched off in the car or when the plug (attached via USB to the computer) is removed after updating maps, etc. The change is fairly recent (last couple of months) and I initially thought it might have to do with the state of the battery, which I have subsequently replaced ... with no change in symptoms! I had also thought (although couldn't understand why it would be so) that the change in map installed (originally European maps, but now just UK and Eire), but the power problem started before the maps were changed!
Under 'Settings/Battery saving', I have ensured 'Device stays on when external power is lost' is NOT selected and 'Device switches on when connected to power' IS selected, but to no avail. I have also set those 2 selections to the other combinations, but also to no avail!
Has anyone ANY advice of what might have gone awry?