You could try limiting the number of peer connections per torrent to 20 or 30, that is what finally worked for me when my connection used to drop all the time. Also limit the number of torrents running at once to 2, 3, or 4. My connection used to drop running Azureus, so I switched back to Bittornado 3.18, which has encryption. Also use a port between 50,000 and 60,000. The default ports are known to be used for bittorrent by ISPs so they throttle them.