Hi Hobson1 and welcome to the forum.
Im glad to hear you are considering joining Virgin media.
Your requirements and the advice you get needs to be very specific to you and your property.
I am happy to take a look at what you want to do and advise ...
I don't have a draytek or a HUB5 so your mileage may vary.
I am running PFsense and the boot order for me is to FULLY boot up PFsense before switching on the hub.
Can you manually choose a gateway on your router and if so what's it set to?
It's only a hunch but it sounds like a slight delay to the HDMI anti copyright handshake. Using arc does slightly increase the chances of that as there are more devices gettings their credentials in order to proceed with a stream.
Try connecting dir...
If the issue isnt being caused by the activation mentioned above the other thing to try is to hold the pinhole reset button for a solid 30 seconds.
If after those 2 steps you still get the red light then it will be caused by a signal issue on the ca...