Hi!
It's a huge problem indeed.
First of all it's the shame for japan brand. Second of all - they deny warranty repair. Last of all - sony nomore!
Take a look - http://www.youtube.com/user/SonyBraviaBandingBug#p/u/6/M7VNWAB2rqM
THE Ultimate viewing experience - http://www.youtube.com/user/SonyBraviaBandingBug#p/u/3/3i7rc-1syOA
Sport - http://youtu.be/s48hQTMggUQ
If you have questions - please ask.