Just reading this thread. The same thing happens to me with the Comcast SD 2500. Setting a vcr reminder and turning the box off results in no audio. Leaving the box on, it'll turn to the correct ch with no problem.
If there were compelling programming on the handful of additional channels on the box, I might have called in and complained. But I'm so tired of this company, I just don't feel like hassling with them any more than I need to.
Dazed and confused over high tech.
Sigh...Concrap. The Internet Overlord Cometh
They're not com-tastic!