Spotify keeps stopping playing songs because "present song cannot be played"

[1124643748]

Spotify keeps stopping playing songs, after ca. 10 seconds, and displays that the present song cannot be played. I've never had this problem before.

* Spotify desktop app 1.0.44.100

* premium account

* Windows 7

* perfect internet (yet, Spotify is even worse on LAN than on WLAN!)

* firewall settings OK

* I've tried:

* restarts op Spotify

* logout & login of Spotify

* restart of complete computer

* logging out, changing the Facebook password, and logging in again

To no avail.

please help!

Gijs