Hi Gary,
OK, I think we're down to three possibilities.
1. The microSD card has become corrupted and needs to be re-flashed or replaced.
2. The B2's internal HDD has become somewhat corrupted and needs to be re-formatted.
3. The CD Drive or other hardware in the B2 has become faulty.
I have listed them in my order of likelihood but that is only my view.
Point 1: can be addressed by either obtaining a replacement microSD card from Brennan (under warranty if I understand correctly) or by re-flashing the existing card using the software which canbe downloaded from the Brennan website.
Point 2: can be addressed by reformatting the B2's HDD - 'Settings' --> 'Maintenance' --> 'Advanced' --> 'Format HDD'.
Caution: this will delete all of your music from the B2 so make sure that your Export is complete and good.
When this is complete (a few minutes) then run 'Import' from your USB Export backup which restores your music to the B2.
Point 3: return the item to Brennan for repair under warranty.
If you want to re-flash the existing microSD card, just liet us know and we can give you help if required. Once you have downloaded the two files, the re-flash takes about 10 minutes, so it is quick to do. Below is a link to the instructions if you want to research it. Scroll down to 'New SC Card' on the left side of the web page.
Regards,
Peter.