Expand or stretch HDTV

  Sometimes pressing the HD Zoom button on my remote will Zoom, Expand, or Stretch the screen on my Samsung HDTV. Sometimes it will not!  Changing the settings for my TV has no effect. 1080,720.480 does not matter. Thursday night I could Zoom the TV but Friday I can not. Is it a software problem like it seems ?  After reading some of the posts,I believe other people have this problem but it is hard to explain. Anything intermittent is can be a real pain.  I have more than one remote  so it is not the remote. I only have one HDTV.  A minor problem but irritating. Need to understand and fix by football season. Thank You. 

My problem is the Comcast cable box. You asked me two questions in your reply that I had already answered in my question. Only on one HD TV and every remote.Power off and Resetting the Comcast cable box fixed the problem.  I really should not have to un plug my cable box in order to maintain all of its functions. Some things never seem to change. If I get X1, I wonder how often I will need to un-plug it to keep it working properly. 

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