Terrestrial HD channels scrambling

[yabba]

Hi, I have a vu duo box and recently my terrestrial HD channels (BBC 1, 2 ITV and Channel 4) are scrambling and unwatchable. Its not the end of the world however as I can just watch the SD versions.

Can anyone shed any light on why is this happening?

I've got around 90% SNR on them? All the sly channels are fine?

I've checked all the cables, dunno what else to try

Thanks

 

[cactikid]

if your sat freeview are scrambling i would be looking at line of sight of sat dish/lnb.
did you try a new scan to see if it still pulls in 900+ channels.

 

[yabba]

if your sat freeview are scrambling i would be looking at line of sight of sat dish/lnb.
did you try a new scan to see if it still pulls in 900+ channels.

Thanks for the reply. I thought it may be the dish but with me getting 93% SNR and 99% AGC I discounted it.

Autobouquets scanned 690 odd channels

is it just a case of moving the dish until the scrambling stops?

Its a fixed dish btw