Is anybody else having problems with the colour on Channel 5?

[WeBuiltThisBuffetOnSausageRoll]

I've looked online and can't find anything, so I'm wondering if it's just us. We're watching through Sky and the colour is really unstable, constantly randomly changing and wavering across the colour spectrum. It started on Monday, so I assumed it was a temporary glitch at Channel 5's end, but it's been doing it permanently since.

The weird thing, though, is that it only does it on Channel 5, Channel 5+1 and - sometimes - on the on-screen Sky guide; no other channels at all.

Is anybody else experiencing this and/or do you know what the culprit or fix might be? Our Sky box is old, so that may be to blame; but if so, why only on Channel 5?!

Same problem via the Sky dish just for the Channel 5 group of stations and previously for the now vanished Smithsonian Channel, All the rest are OK. I have reported it to Channel 5 admin and, as they requested, sent a small movie to show the colour fluctuation. Waiting for their reply. Channel 5 is OK on the ordinary aerial but that doesn't have the extra 5 group of channels. Yours is the only internet link I have found which mentions this problem.