Hi BusmanBob,
Thanks for taking the time to contact us via the Community. It's lovely having you on board with us in the Forums. ⭐
We're sorry to hear you've had issues with pixellation. Checking here, there are no signal issues or area faults affecting you.
Please check that resolution on your box is set to Automatic. You can check this by going into Settings > Audio & Video > HDMI resolution > Automatic.
You'll also need to confirm that the cable is securely connected to both the set top box and the TV - disconnect and reconnect the cable to be sure. If that doesn't work, please try connecting the cable to a different port on the TV and finally try using a different cable.
Keep us posted on how you get on.
Many thanks,