Tiny210v2 error USB Device not recognized"

Thailand
Dear all

 I have many friendlyARM production.
Tiny6410 = 2 set, Tiny210v2 = 2 set

When i connecting to my computer, this error happend from Tiny210v2.
Tiny6410 no problem.

( My computer used window xp sp3 and Microsoft ActiveSync 4.5.0 )

I'm very doubt in this problem,
Yesterday i'm receive new Tiny210v2 1 set, try to connect to my computer.
in the first time no problem.

but today i'm try to connect again ,it is show error.( from second time )

Please help me
Thailand