The error S0a00 is the Comcast equivalent to the DirectTV booting process that last less than 3 minutes and happens in both systems when the power fails and then it's restored back in few seconds. The only difference is that in Comcast this booting process can take a lot more time... 10 minutes... 20... Or even more. Sometimes you even have to call Tech Support to get it fixed. Comcast probably has other advantages over DirectTV but this, this is not one of them. Here in Florida short power failures are common because of the huge amount of lightning strikes during summer.
Update: I called Comcast and they were having some problems in my area. The signal was restored after 40 minutes. After that another power failure but this time I got the signal back in less than a minute.