I've just sorted my missing BT sports channels on YouView. 1. Switch off box at rear with toggle switch and wait at least 10 seconds. 2. Switch box back on with toggle switch on rear, then turn on at front (blue light). 3. Wait for box to start up fully and go to setting via YouView button. 4. Go to device management and do a software upgrade. 5. When upgrade complete, check to see if sports channels have returned. This worked for me.