small white bar showing on HD network channels

[strich]

I have a Panasonic TH-50pz80u and have noticed two very disturbing things on networks that run in HD and was wondering if someone had fixes for them.

When I'm watching a network channel, ABC for instance, on their HD channel, there's a small white bar that runs the length of the screen across the top of the picture that's a pixel or two wide. It's only at the top. It doesn't show up on all HD network channels, but most.

the other issue is the sound cuts out every 10-15 seconds for a second or two. It was unnerving at first, but i've almost grown accustomed to it.

I'm guessing both problems are the inadequacies of the network trying to display a mediocre quality HD picture since neither of these problems occur on the normal channel (regular vs hd).

I don't know if these are settings i've just not discovered yet and can be fixed or i have to just grin and bear it.

thanks