Sky + 160 - sound problems

Had this new box for a few weeks now with no problems until now!!.....

I get a very distorted sound through Sky +, picture is fine, but real problems with the sound.

The box with a separate tuner is fine upstairs.

The TV is fine when playing terresteral TV, plus the DVD is fine as well.

Thought it was my amp but no, still noise through the TV speakers.

Clearly the RF cables are the issue

Sky are coming out on Friday, and the helpline didn't know whether any recordings until then will be OK or not, I suspect not, but what about those made before?

Forgive my naivety, but do I have any other options?

Any help most appreciated