Got the two yesterday and one of them is not going into standby mode.
Both crackle when they attempt to go into auto-standby but just one does go into autostandby after that.
The one that does not go into standby does crackle everytime the autostandby duration is reached. So I set it to 1min, it crackles ever minute even while music is playing. If I disable autostandby = no crackle. The behaviour is the same with cables attached or no cables at all.
Firmware 1.2.1 both are recognized in Xmonitor and they do sound great otherwise.