Well I think I've sorted it - it's been playing normally for 2 days now (off and on). I ended up deleting the b2, re-formatting the HDD and then restoring from the ext. HDD once again. Even though the restore appeared to finish, I kept on selecting restore from C, until it appeared that everything had been fully restored. Don't ask me why this was necessary. Also I'm wondering if there's an internal battery such as the one on a PC motherboard because each time I loaded the internet radio presets - for the past week on switch on, they'd be back to whatever the Brennan defaults are. So possibly with all the "on" time lately the presumed internal battery has restored it's nominal voltage and the memory has been preserved. Just a thought that's all, I might be going off on a complete tangent in the opposite direction. So far then, so good - long may it continue.