BBC News is high band Horizontal, though most of the regional channels are low band. See if it the drop out is only on certain channels, and if so let me know which ones. I can look them up and see if there is a pattern forming. LNB's can fail only on certain parameters. If you can, check the dish, LNB, and mounting for security, it won't take much movement (a gust of wind for example) to cause problems if anything can move.