Does this happen whilst you are sitting close to the Hub - or only in distant places. Do you have any other wifi devices where this is or isn't, happening ?
Can you connect on an ethernet cable directly into the Hub - and when you do does it still happen?
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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.