Is it the network connection dropping or just your wifi connection to it?
To test that, connect a device too the Hub on Cat5e(or better) ethernet cable and see if that remains connected at the same time as the wifi ones. Let us know.
Also what Hub model is it and what are the lights on it doing/showing at the same time?
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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.