Try again
You can close the menu or the guide using the back button. Then open it again using the menu button on your remote.
Restart your box
The old “switch it on and off” routine. Overused but it can often help resolve the issue. Press and hold the 
button on your box for 8 seconds, then let go. You’ll be greeted with a friendly ‘Hello’ telling you that your box has restarted.
Restart your router
The simple old trick of restarting your router can help resolve this issue. Switch it off at the plug for 30 seconds and turn it back on. Give it a minute or two to warm up then check if you’re reconnected.
Please don't leave this page while your router is restarting as you won't have any internet access.
Using Powerline Adapters?
Make sure you switch both adapters off for 30 seconds and then turn them back on. Give them a minute to reset and all the lights will come back on.