I Report two problems on 32PFL7606H fw Q5551_0.14.76.0:

1. Sometimes when I use NetTV, the TV switch off by doing a little crackling sound. I happened 4-5 times in all since I have the TV (1 month). What is it depend?

2. Youtube has become unusable with the latest firmware. In fact it was introduced YouTube Leanback: nice, too bad it takes pictures at a resolution that wireless (g) can not stand. It is always nerve-wracking making the buffering of a video display. Even using the pause trick to fill the buffer is of little use because the buffer is small.
How to solve? Is it possible downgrade?

Thanks to those who answer me.