I think it might be also related to the new "WIFI UPDATE", Virgin sent me an email saying that the wifi had been updated and it's not been great since. Could this be the problem aswell as the power cut affecting it?
Personally, I would switch off the combined channel feature, which is what I think the Intelligent Wi-Fi update enables, and run separate 2.4 and 5 GHz bands, with each band on a fixed channel, then connect your devices to your chosen band.
Welcome to the community and thanks for your post.
I'm sorry to hear that you're having issues with your connection at the moment.
I have been able to locate your account and cannot see anything that would be causing the issues that you're having. I can see quite a bit of packet loss on the BQM, did you restart your hub around that 8pm, were the red line is on your BQM.