I have just purchased a KDL-43w755c. I have an issue where HD channels are pausing/breaking up and then failing leaving a black screen displaying antenna problems. Re tuning resolves the problem for a time, usuallly until I restart the TV. I can watch all HD channels through my Youview box with no interruptions in signal. Analogue signals also seem fine. I have only had the screen for 5 days so persevering for a while longer but not impressed. Any thoughts would be greatly appreciated.