Hi, thanks for replying. No - it doesn't fit that behaviour..
I have defined in that in standby mode it should not turn off automatically, i.e. it should remain in Standby. ('TV-Box' tab and NOT select 'Save energy'.)
The additional thing about the Swisscom box 21 going into deep sleep mode should also not apply, because I have set that it doesn't turn off in the energy settings (and, it's annoying that this box doesn't have an on/off button, I've had to scrabble around the back of the device to remove the power cord at least 4 times now in 2 weeks to force it to restart when stuck somehow..). My girlfriend's box is much easier, just put the hand around the back and turn off etc. We both can do with our eyes closed now..
So, basically, it is turning off completely, and is doing a new start each time I come home.