Googling for Sky Q HDCP does indeed bring up what look like similar issues. I think it's an industry-wide problem. It does seem a bit odd that these devices are capable of downgrading their own HDCP on demand, so all a pirate would have to do is make sure their illicit disk ripping device is not an HDCP 2.2 compliant one so that the V6 switches to a less secure mode, or else buy a black box off Amazon for £9.99, then they are back in business.
My 2014 Yamaha RX-V777 appears not to be HDCP 2.2 compliant and my 2009 Loewe TV certainly isn't, but it all works fine for a couple of weeks at a time and then goes blank. What seems to work is switching to a different input every couple of weeks. I'm not sure what will happen when I eventually upgrade the TV.