The V6 works best if connected with an ethernet cable. Are you using wifi or ethernet?
If wifi, use your remote and go to Home > Help & Settings > Settings > Network
In the top-right, the box should say connected/online - what's the signal strength?
There are timestamps in the top-left corner. These usually operate on 6 hourly connection cycles and will show either Success, or a reason for failure. If it's a failure what message does it show?
If you are using an ethernet connection make sure it's plugged in tight and snug. Some of the ethernet cables work their way out. It might be an idea to replace it with another working cat 5 pr cat 6 ethernet cable if you have one. Using your remote go again to Home > Help & Settings > Settings > Network.
At the left hand side of the screen it should show last status which should hopefully say connected. If it doesn't, or it hasn't made any further connection attempts since you last had the problem then click on Connect to Virgin Media Service now. You can also test your network connection from the same screen, ignore the port configration test section.
You can also run a speed test which will show if you have any network issues affecting the strength/speed. To run the speed test with your remote.
Home > Help & Settings > Help > Our Other Products > Broadband > Take a Speed Test > Press Play (DO NOT PRESS OK)
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