I changed the 3TB GoFlex drive that has it own power supply with a 1TB 
Toshiba portable drive without an external power supply and it seems to work. 
I guess the fact that the GoFlex drive has its own ps is a problem and maybe 
there is a sleep mode that it goes into. 
Anyway thanks for the solution. 
I would never had guess that one.
This looks like a good forum with answers.
So is there a way I can mark this topic as solved or should it be locked out?
Thank you,