I'm running 1.9 here in the UK, and have been experiencing the no system sound problem if I don't use the unit for a few days.
I thought I'd attach a link to a little video I took which shows the problem.
http://glaspole.googlepages.com/MOV00728.MP4
Any advice gratefully received. I was thinking if reflashing the firmware and BT software again to see if it makes a difference.