Pixelation when moved box on Cab

I was setting up y box in one room and was finally happy with the setup.

So I moved and installed the box to the room I wanted and plugged in.

The sly works well but on the cab I get pizelation, has anyone come across this.

I should not need to re-scan should I? It's within the same house. I don't think its the cable but if someone thinks it could be then I may tray and cut and re-connect.

Thanks

Just an update, it was the cable.

I tried a different cable directly from the input in the house and worked OK, so now need to re wire and hide cable.

Fun times!!!