Having a problem with certain channels on my stc6000 problem being that the audio description will not turn off. This only seems to occur on a small group of channels(Atlantic ,living,one). Normally the yellow button brings up a sub menu where you can turn the narrative on/off but this doesn't work with this group of chans , I have also tried altering the audio pid on the advanced search menu to no avail as I say 95% of the channels on astra2 work perfectly well any ideas?