Had this type of problem downloading a different game from Origin. I looked and I was connected both over ethernet and wifi. Disconnected the ethernet, allowed it to go only over wifi, and now we are all good. I expect the Comcast gateway was getting confused by the traffic, because it was shutting off everything but the power.
FYI: running Windows 7, downloading over a 250 Mbps connection via Comcast all-in-one gateway.