I am having the same problem as I had in January where my upload speed is restricted to 50mb. I am unable to complete a Speedtest too with an error saying ‘Sorry, we are unable to test your speed’. I have restarted the hub multiple times and have also done a factory reset on it but nothing has changed. Hub Software was upgraded to v0.27.06.04290-BT on the 16th July, so I suspect the issue started then.
The latest a software upgrade on the Hub also doesn’t appear to play nicely with Sky Q as I regularly see my Sky Q box dropping off the network requiring a reboot of the router, the Sky Q box or me having to re-enter the Wifi details.
Thank you, Steve