OK first thing to know is...
Are the issues only evident on wifi connections or do you see them at the same times on devices connected on ethernet cables? If you don't know, can you check to help diagnose whether it is just a wifi issue or it could be network connection/Hub related?
What Hub model is it? What are the various Hub lights showing/doing when this happens?
Tech saying get your own router implies that they thought it is just a wifi interfence issue and not network connection/faulty Hub related.
If you cancel VM after 14 days from connection you will be subject to early disconnections fees.
Some information on cancelling & early disconnection fees are here...
https://www.virginmedia.com/shop/the-legal-stuff/terms-and-conditions-for-fibre-optic-services#endhttps://www.virginmedia.com/shop/the-legal-stuff/terms-and-conditions-for-fibre-optic-services/early...
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John
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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.