Bandwidth with 150B

A month ago I complain about the transfer speed between the devices ( computers and NAS) and the 150B. Not to long after I moved the 150 B to another switch and It start transferring at good speed. I was happy.
Today I am not happy at all. The transfer speed is so slow that is ridiculous. Between every other device the speed is what is suppose to be. Only with the 150B I do have a problem. What should I do more?
Transferring 9 GB. Has been 3 hours and is only half way.