The power supply used was for an Asus Nexus 7 - a USB charger. I think it's supposed to supply 1A at 5V - but the power saving mode you mentioned sounds like a interesting reason for the issue. It's gone now with a Samsung charger :-) But just for fun I am also reporting the getAnalogVRef to Xively, so when I swap the charger again I would see it in the logs.
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