Hello,
I tried to find an answer to my problem in the forum, but my german is not good enough to find the solution 
I have a Tevii S660 USB connected to a Lubuntu 12.10 and running TVheadend.
I installed the two drivers (usb and dvb) from the Tevii site.
Everything is running correctly, except that when the system is idle for a moment the S660 disconnect and then the usb driver crash.
I then need to cutoff and reset the S660 and reboot the PC to have it working again.
In the past I tried with yavdr 0.4 and 0.5 with same behaviour.
Any idea what to do ?
thanks for the assistance
SP