Hi Rob,
If you post the details of a CD that won't load I will check the Musicbrainz (public database that the B2 uses) to see if its there or not.
This may not be the cause but it may aid diagnosis.
The B2 does appear to be having some intermittent issues with Musicbrainz at the moment and Martin Brennan and his team are looking at them
Paul from Brennan will see your continued problems when he reads the forum posts on Monday and suggest next steps.
John