pixelated tv images

Greetings user_kj27yt! Thanks so much for taking a moment out of your busy day to bring this important issue to our attention on our XFINITY Community Forum. I'm sorry to hear your TV box is still having issues after our recent refresh signal sent. Not to worry! You have reached the right team to assist with matter. 

There are instances when the cords on the back of the TV box may need to be replaced if they become worn-out over time which can affect the picture quality. Do you recall how long you have had these TV boxes at home for? Also, let me know if they are connected with an HDMI cord or A/V jacks from the box to the TV. You can check how to identify the cords connected behind the TV box through this link here https://www.xfinity.com/support/articles/audio-connections.