Hey there, I apologize for the experience! Did you have any issues with the second box (besides it getting fried!) Are you having the issues on the same channels as before? We can try follow up troubleshooting since the damaged box was just replaced.
You can also go to your nearest XFINITY store to exchange the pixelating box or we can also send you out a new one. If you do decide to stop by at one of our stores it is recommended to set up an appointment to avoid long wait times. You can do this by visiting https://comca.st/3pCRaIb.
To assist you further or send you a box please send me a private message and include your full name and service address. Send me a private message by clicking my profile name (ComcastEva), and then click "Send a message".
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