To comply with new European power regulations, Cambridge Audio has implemented an auto power down (APD) feature on Stream Magic 6 for energy saving purposes. This means that the product will switch itself off after 15 minutes if it is not playing anything and there has been no user interaction with it during this time. As a default this is set to 15 minutes, but you can increase or decrease this time, or turn this feature off altogether if desired.
The Auto Power Down setting can be found in Settings > Advanced > Automatic Power Down. There you can adjust APD from OFF to 1hr, in 5 minute increments.