If you'll briefly re-acquire the will to live and do the following we might be able to help you:
When the hub has been running for a good long time (and ideally speed has dropped, but BEFORE you reboot it) connect to the hub by clicking on this link http://192.168.0.1/ That should pull up the log in page for the hub. But don't log in, just click on the link "Check router status" That'll bring up a window with five tabs. Open the Downstream tab. Select all the text (Ctrl-A if using a keyboard), copy it (Ctrl-C), then paste it (Ctrl-V) into a reply here as TEXT not screenshots. Post that, do the same for the Upstream and Network log. You'll get an error message when you post the Network log, just click on "post" a second time.
Then we can check for any obvious problems with power, noise or error counts. If that is all clear we'll look at other possibilities.
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Is that on ethernet connections or wifi ones or both?
On what devices? Are those being limited to 100 by the ethernet cable, the NIC card connection speed, bad drivers, QoS software, or connection on the 2.4 wifi band rather than 5GHz?
-------------------- John --------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.