this TV incorrect aspect ratio - XFinity

Some commercials appear to fill screen correctly, however majority of programming is stretched horizontally with black bars on right and left side of screen. Same programming on other channels resolves correctly (For example, In The Heat of The Night on WGN). Also receive "Poor Signal" message sometimes, which never happens with any other channel. Problem occurs with Set-Top Box and Digital Adapter. This issue started approximately one month ago. Thank you.

This question, "this TV incorrect aspect ratio," is about XFinity-Comcast TV channels, programming, and sports.

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