I see you are using Bittorrent.
I used to have the same problem. I found it used to crash my old Pace 4000 box all the time. Getting a new Samsung box for the BB sorted it for me, but if you can't upgrade your box, you should throttle the connections settings in the application (or on your router) to stop flooding the STB.
More info can be found here:
http://www.cableforum.co.uk/board/showthread.php?t=9418
HTH.