First question is always... do the drops happen at the same time on ethernet cable devices as they do on wifi connected ones, and what are the various Hub lights doing/showing when this happens?
Re. contacting VM calling it in as a fault (on 150 VM line - or 0345 454 1111 others) and see what they say when they test your connection.
If they think its just a wifi issue they will offer you a "Pod" (when they come back in stock) and charge yiu £5/month for it unless you are 1GB or an Ultimate Ooomph package - if that the case - forget it and buy your own better quality wireless equipemnt
Calling at 08.00 (Mon-Sat) or 09.00 (Sun) gives the best chance of getting through quickly.
You can also text them on 07533 051809 include account name/number and what the issue is – replies usually take longer.
Or, a VM person should pick this thread up and be able to help but it can take 5-10 days.
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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.