I just recently noticed this issue discussed on engadget, primarily because I leave it connected to the syc cable all day which keeps the battery topped up. I also wonder if its related to the reports of the much shorter than advertised audio playback battery time. The review shows only 22 hours of real world playback time with wireless off, which is far less than the 30 advertised. I've not verified this myself, but I'm sure my experience will be slightly different given that I use a set of Bose headphones in place of the included premium in-ears.

I'm sure both these issues can be worked out with a  new firmware release, I just hope its soon. Until then though, MS recommends you manually power down the device by holding back and down. And, I would leave the wireless adapter off until you intend on using it for sync or social.

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