s9 why do my freeview chans get scrambled

[webhead]

why do some of my freeview chans keep coming up as scrambled this is annoying , anyone know why , like 5 star worked the other week.

[darcu5]

5* 5*+1 5usa 5usa+1 have just changed frequencies, you will have to check kingsofsat.net for new transponder list and input them into your box using your remote