I have the same model, and the same problem. I even switched the clock function to manual, rather than automatic, but it stills resets itself (it seems like if it were set to manual, it shouldn't check the PBS channels automatically, but apparently it does). You would think there would at a minimum be a firmware fix available, but, like you, I have seen nothing. In fact, I Googled this problem, and your posting was the only match I got. I hope someone has the answer...