Same issue for me, called 150 'Mohammed' from where ever ran tests to no avail. I rebooted also to no avail. He said it was because the system was updating. Phoohy!!. Advice not fit for purpose. Followed advice from on here held WPS button down for 30 secs and it went out. Wonder why it started however?
Maybe VM should advise service advisors or they should look on here.
Finally I would add there were no issues with the supply.
No, no problem at all but the green wifi light is constantly flashing even after the old "turn it on and off" routine and I've no idea why. The white base light is constant and no other lights are showing.
I have reset the HUB 3 to the factory set-up by pressing the reset button for 20 seconds. This did not resolve the issue but forced me to set all devices connected to the HUB using the WPS method, when all devices been connected. I reset the HUB and to my surprise green light is not flashing anymore. The only thing I can think about it is that the Printer (more likely) or one of the devices was to trying to pair with HUB continuously. I think the problem occurred, when I changed the Hub's PW (the green light start flashing).
Note: I did not use WPS to set the new PW to all devices, I typed in the PW.
On the basis of 'How often do I use it anyway?' I have turned off the WPS function and that has removed the flashing light. Not the answer I was hoping for and Virgin really should put more effort into solving the problem but at least the annoying flashing light has now gone.
Details of how to access the hub settings page are on a sticker on the bottom of the your Hub3
This has proved to be a permanent fix for many months, all other resets etc were only temporary fixes (at least in my case)