I did not need to unplug. I simply held the power button on remote for 20 seconds in the process of turning off the television and held the power button on remote for 20 seconds in the process of turning on the television. Loaded right up afterwards. I'll be needing to do this regularly as we implemented parental controls on our router and everytime the internet is shut off or on as scheduled it seems it will be necessary to power cycle the television.
Unplugging, then waiting 1 minute before power back on. Then holding power button for 30 seconds worked for me also!!
I tried that too. Didn't work. Watched YouTube videos, fixed it. Unplug TV for 1 minute. then hold down power button for 20 seconds on remote. It will reset cache. This worked for me.
Deregister your Device & resetting did not help!