Sorry, didn't grok all that you wrote - re having just the 31's. I don't currently have a C31, but have read of others with the same issue. I've also read of some issue with Airport, and I will alert the man who's written about it to look in on this thread. Also, I was convinced to change all my DNS servers to someone outside of Comcast's default. (Didn't take much to get me to dump them on that part). That helped the iPad app- a wonderful app- hook up a lot quicker and more solidly to the receivers. However, let's see how your new box works, and go from there.