I just got my Sony XBR970, and I'm having trouble with the tuner. When it tries to lock into a digital signal that is a little weak that day, for whatever reason, it just sits there for a very long time, trying to tune it in, sometimes for 5 or more minutes. The screen is blank during this time, and the TV won't let me do anything else with it, like switch to another channel or input, or call up the menu to take any other action. Is there something I can do to get around this locking-up problem? Is there something wrong with my TV? I called the SONY help number, and the person on the other end didn't seem to know any thing about this.