Reinitialize an usb device

Hi to all,
I've discovered thet mine dikom dk-300 usb device has a weird behaviour.
If I connect it to the pc it works well both in digital and analogue mode, but after some time it is connected, without being in use, the analogue sound stops to work. The only way to have it working again is to unplug and replug the device. I wonder if there is a command to reinitialize without the need to phisically unplug and replug it.
Thank you,
Andrea