"Comcast Doesn't Interfere With Active Network Connections"

Comcast claims that they don't interfere with active network connections. ORLY?

Either Comcast is, say, lieing, or Steam has some pretty severe reliability issues. The following log takes place over 12 hours:

Tim: I really wish you could shoot your own teammates in UT3
Tim: Their dead bodies might be more useful as meat shields
Tim: Oh, of course. This mission is difficult because it's 4vs10. This is fair, and not Fake Difficulty.
Tim is now Away.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Connected again and rejoined chat.
Tim is now Away.
Tim is now Snooze.
Tim is now Online.
Tim is now Away.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Connected again and rejoined chat.
Tim is now Away.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Connected again and rejoined chat.
Tim is now Away.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Connected again and rejoined chat.
Tim is now Away.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Connected again and rejoined chat.
Tim is now Away.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Connected again and rejoined chat.
Tim is now Away.
Tim is now Snooze.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Connected again and rejoined chat.
Tim is now Snooze.
Lost connection to Steam, will rejoin chat automatically when connection regained.
Tim is now Offline.
Connected again and rejoined chat.
Tim is now Snooze.

So either Steam has massive reliability issues... or Comcast keeps on disconnecting me for no reason. (No, I wasn't downloading anything through BitTorrent while this happened.)