Freezing But Only On Certain Channels

Had my cable running for a good month and been more or less glitch free.
Just in the past week-ish some channels are constantly freezing.

BB1 HD is particularly bad yet any of the sky movies HD are absolutely fine.
Weirdly also, Eurosport HD1 is fine, Eurosport HD2 is pretty much unwatchable

Any suggestions?
 
if in uk can you say what snr,agc and ber you are getting as another duo2 to me has strange signal from what i get in irl cheers.forgot mention box type also please.
 
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