2820 dos protection UDP threshold is too high, (even by default for torrent) turn it off or reduce it + the timeout and torrents will run better. the draktek is seeing the UPD traffic as an attack. also i have notice that the latest version of utorrent doesnt work too well with 2820, revert back to prev version or cut out these clients and straight back to BT shadow release, get the best speeds and complete control of your torrents