Just to clarify mine does not usually lock immediately. It has ranged from within half a minute to maybe a few hours before activity ceases. Since I have the LEDs on the front panel it only needs a glance for me to know.
I have tried different plug packs. One capable of 1 amp at 12v, the other up to 3 amp 12v, and of course I have changed USB cables.
The memory logger flash test recording all 0's when 12v was supplied was curve I did not expect. I am not sure the significance of this. It possibly may explain the day my PC auto restarted on a Windows update and stopped at the login screen, (Windows 10 Preview actually) whilst I was at work. I expected a large log download when I restarted it and there was nothing. Only I cannot remember if I had left the 12v supplied or not. Otherwise, if I leave only the USB connected and Cumulus is not running, there are archives downloaded when I start Cumulus again.
I will do more checking; as far as I can see Windows 10 Preview has been working perfectly with this. I will test separately again to be sure, and see what happens when only plugged into 12v power, as well as putting my Windows 7 laptop on for awhile. I probably will not get to that until the weekend.
I have tried different plug packs. One capable of 1 amp at 12v, the other up to 3 amp 12v, and of course I have changed USB cables.
The memory logger flash test recording all 0's when 12v was supplied was curve I did not expect. I am not sure the significance of this. It possibly may explain the day my PC auto restarted on a Windows update and stopped at the login screen, (Windows 10 Preview actually) whilst I was at work. I expected a large log download when I restarted it and there was nothing. Only I cannot remember if I had left the 12v supplied or not. Otherwise, if I leave only the USB connected and Cumulus is not running, there are archives downloaded when I start Cumulus again.
I will do more checking; as far as I can see Windows 10 Preview has been working perfectly with this. I will test separately again to be sure, and see what happens when only plugged into 12v power, as well as putting my Windows 7 laptop on for awhile. I probably will not get to that until the weekend.

