[SOLVED] Cache full

[Nexus S]

Hey all,

i set up my RPI (Model B 512mb Rev2) with Xbian today and started UPNP Streaming a MKV Testmovie (Big Buck Bunny) from my synology to xbian.

then, there was a message box saying "cache full before something something something..." - and the movie stutters all the time, this also happens with other MKV testmovies...

Is there a way to resize the cache?

Thanks for helping a newb
Benno