"It's been widely reported that Comcast is engaged in a sneaky form of Internet filtering. The company is terminating its customers' BitTorrent sessions by sending misleading data onto the network. The end result is that instead of targeting key heavy users, Comcast is instead engaged in an all out war against P2P protocols. In an interview with CNET, the Electronic Frontier Foundation's Fred von Lohmann states that Comcast is 'throwing a spanner in the works of the Internet, hoping that this will somehow reduce bandwidth usage overall.' Other lawyers seem to have smelled blood, and are circling in the water. Lohmann reveals that '[The EFF has] already been contacted by attorneys who are considering legal action against Comcast.' Could Comcast be facing a class-action?"

comcast is resetting your p2p connections..i think there's a class action lawsuit getting organized somewhere..my suggestion: change your isp and tell them why you did it
I don't have a choice. Comcast is the only cable supplier and I live too far away for DSL to work well.