Some channels such as Quest & QVC are pixelated this started about a week ago and is still ongoing, both channels have a 100% signal quality & 92% signal strength. I live in the North East and wondered if any one else is having the same issue.
Are these HD variants? If so they're due to be switched off so may be on reduced power.
With such high strength and quality it could be that they're overloading the tuners in the box. You probably benefit from a signal attenuator which can be picked up for a couple of quid on Amazon. This will allow you to turn down the signal strength being received.