If it is a wifi only issue, then all you can do on a Hub3/4 is to try separating the SSID's of the 2.4 and 5 GHz wifi bands by renaming them in the settings and at the same time switch off "channel optimisation" apply and save the settings. All wifi devices will need reconnecting to the best SSID at each location. Also use a wifi scanning App to find the best wifi channels to use (just select and use channels 1,6,11 on 2.4GHz) - this often helps Hub3 users get better wifi performance - but its still no substitute for getting better kit 🙂
To address the wifi, VM now supply “wifi Pods” (no longer doing “boosters”). Pods are only free to customers on 1GB, Ultimate Oomph or Volt packages - is that you?
If not… you will be charged £5/month - note that BT charge £10/month for their wifi solution. . Its a simple solution and should work for you. However, you would soon pay off that cost by buying a "better" wireless solution that will be yours to own and use forever but it isn’t the simple plug and play option of the Pod(s).
-------------------- 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.
Are you able to confirm if this is only occurring on wifi? If so then there may be several factors that can impact wifi signals such as, where the hub is located, objects surrounding the hub, wall density, reflective surfaces, radio interference from other electrical devices and others. These things will not be picked up by our diagnostics and would not be a connectivity issue that can be escalated. In some instances, our wifi pods may be needed based on these factors. https://www.virginmedia.com/broadband/intelligent-wifi
Other solutions such as the one offered by jbrennand, may also help with wireless connection.