If you mean the brown/white box attached to your wall, then all it is as a fault - after all - it is and see if they will book a Tech visit for you.
If you get fobbed off then a VM person should respond on here in a day or two and sort it out for you.
Post a photo of the issue so they can see it when they get here.
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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.