said by gr8sk8:I have something wrong with my cable modem.
It's this. Comcast long ago figured out that picking on a protocol wasn't the right plan, and instead implemented a far simpler, fair, and sane system that changes your packets to a lower priority under specific conditions.
Bittorrent is more then capable of overwhelming cheap routers and modems if either is even remotely marginal, at very high bit/connection rates.
With very careful tuning of my SMC8014, I have 0 issues running torrents over a 12/2 connection. When I was having hardware issues with my 8014, torrents were the easiest way to reproduce the modem issue, since they stressed the hardware most.
To troubleshoot, remove everything from your network, isolate the modem
(pc) -cat5/6-> modem -> coax from the wall...
Run your torrent(s)
Modem falls over? Replace modem.