Sorry for my late reply, have been away for some time ...
Yeah I have tried everything I could think off. cables, router, drives etc.
@ivan: To answer your question. I have this issue on all my workstations, laptops, desktop (old XP and new Win7) so I really don't think it could be related to software or any update. I thought about it as well in the beginning but the issue is going on too long now and I even had everything reinstalled once on my old XP box and after a clean install I had exactly the same issue. Also when I just installed Win7 on my newly build PC, I immediately had the same issue. Really frustrating !
I've read about 'fun plug' but I'm a total noob concerning Linux so I don't know if that could help in some way?