After digging around for a bit, and with the help of Linh, I've formulated a theory that they're breaking up because of money issues. Turn-A sounds like a last-ditch effort to re-record old A songs and then sell them to make some emergency cash. The low quality and poor reception of those CDs put the nail in the coffin for this band.
It's sad but VK is expensive and as much as I liked them they never got the push they needed to really make it. Also Nimo, if you're lurking now would be the time to jump in. Tell us you're going to form a new band "B" or something. Anything pls.
EDIT: Also Linh makes another good point. They all die at the end of this music video. That supports my theory even more.
Someone bake this woman brownies. She's cracking all the mysteries today.