Could be the box, but could equally be a signal issue. Check that the white coax cable connecting the box to VM's network is screwed in tight at both the box & whatever it connects too at the other end (splitter, wall outlet etc). If the cable is secure then contact the faults department & they will investigate.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV+), Talk Unlim Telco, VIVID 100, Virgin PAYG Mobile