I know this issues was already reported in here, but I haven't seen any answer!
So , I got 2 sticks running on a USB powered hub (48w).

The sticks are running fine at 200mhz, but after some time, the stick number 2 goes zombie!

Has anyone found a solution?

http://farm5.staticflickr.com/4284/34887463404_bda43dddd9_b.jpg