Anyone have any ideas on the following ; On the screen of the Panasonic TV TX-32PK20 i can notice a very feint pattern of lines at the bottom of the screen. They are in a rainbow pattern that start at the bottom left of the screen and then arcs towards the centre and the back down to the bottom right. The picture itself is not distorted. I initially wondered if it was due to interference from my other equipment that is connected, DVD, AMP, Sky Digital and Video. However if I unplug all these it is still noticeable. Any help is appreciated. Thanks.