Every once in a while my 811 receiver deletes some of my OTA channels?? I'll turn it on one time and my WPVI ch. 6 is missing but ch. 6-02 and 6-03 are still there? And it most always happens when i'm getting ready to watch LOST. It's like the 811 knows thats my favorite show and delets that ch. just as I'm getting ready to use it. It has happened with one other ch. before too.