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S0A00 messages are generated by the cable box when the signal for the channel you are trying to watch is not usable. This might be because of incorrect account settings at Comcast or a bad box, but is most likely due to a poor connection between the box and Comcast's network. With digital service the picture doesn't slowly become more and more snowy like it did with analog. Instead, tiny changes in signal strength and/or noise level can cause channels to go from a good picture to a bad picture to no picture.
If you can't find the problem, call them at the phone number on your bill or 1-800-Comcast and ask them to check the account setup and send a refresh signal to the box. If they can't fix the problem during the phone call have them send a tech out to identify the cause and correct it. If the tech finds bad coax, splitters, or connections in your home you'll probably have to pay for the visit unless you have their Service Protection Plan (http://www.comcast.com/spp/, about $4/mo). If the trouble is due to a faulty Comcast cable box/DVR or anything outside, you shouldn't be charged.