Like I say it's intermittent, when i check Home > Help & Settings > Settings > Network it will say not connected when i have the arrows and 'connected' when i don't, reset fixes it for an hour/day/ whatever.
Home > Help & Settings > Settings > Network. You've clicked the bottom option on your screen marked "Connect to Virgin Media Service now". Don't do this - look in the top-right where your WiFi signal strength &/or connection status is reported.
What does it say? This will be the clue to your problem.
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