Icy Box IB 350 UL problems

I have had this external enclosure for a while now. It has developed a problem somewhere though. Looking back on the forums many people have had a similar problem,

When i try to copy large files off it onto my internal harddrives it comes with errors: I/O device error and other seemingly generic messages.

I have tried flashing it with software provided from their own website, and also some i found on here as well. The hard drive seems to work internally just not through the icybox.

Is there anything else i can check/install?!

Rich