Someone from VM will respond on here - possibly in a day or two.
There are lots of possible reasons. e.g. The location may be at "capacity" so that now more new connections are feasible. If you flat is on the 5th floor (for example) there may be height/distance issues that prevent it happening.
See what they say
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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, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.