BitComet on NAS (WD 4100EX)

Hi,

I'm using BitComet and saving my torrent downloads to a NAS drive, WD-4100EX, and everytime I stop a download and restart it, it does a Hash check.

I suspect that it's because of the NAS location, because when I download to my internal drive, this does not happen.

This is not always convenient however, because my SSD is small 256GB.

Is there some setting under Disk Cache or somewhere else in BitComet that I don't have set correctly?

Thanks in advance for a solution.