1. Most of my hassles were solved by replacing SD cards. (One of the B2s spent some of its life sitting on top of a microwave. Eddy currents, perhaps?)
2. The new software is better than the old software. Upgrading is a good idea.
3. B2 won't compress if you have a browser window open looking at it. (Think there's somewhere in the menus that would force that).
4. Regular use of scan disk helps, especially when pumping a lot of CDs.
5. The wifi dongle supplied is actually pretty good for signal - I did not get better signal with a dongle with a stick-out antenna.
6. Hanging the wifi dongle off a USB extension cable isn't a great solution to Victorian stone walls. It just creates more crashes, perhaps because the connection between motherboard and dongle isn't as good.
7. If there's a remaining weak point in the B2, it's the wifi. Weak connections crash B2 regularly, whatever it's doing, even with the dongle plugged straight into the unit. Like others, I've gone wired, and it works well now.
8. The CD name database could be better. Apple finds a lot more albums than Brennan does.
Those last two points are my plea to Brennan.