> Why is the UPIX un-activated, after it has been un-used for a while ?

The Upix has a "sleep" mode.
The Upix auto switch-off after 2 minutes, when unused.

Just press the eject-button to switch it on again.

Reminder :

Make sure to respect the working mode of the Upix :

- if the UPIX is with its extension cable, it will purge continuously.
- If it is used in its native configuration, i.e. with the small 20cm cable, 2 minutes maximum should be observed to re-plug the Upix on its receiver / base.