Sonos/Subsonic integration

[newpower]

I'm using the Subsonic service in Sonos to play music from my library. The problem I'm having is that the Subsonic web interface shows that I song is playing way earlier than the song actually plays in Sonos (around 30-40 seconds before it actually starts playing). As consequence of this (I think), my songs are getting scrobbled twice (I have the Sonos/last.fm scrobbling disabled). Anybody having similar problems?