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cable box freeze when viewing SD channels on HDTV

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cable box freeze when viewing SD channels on HDTV

Frequently when viewing SD channels on my HD TV (such as MLB Extra Innings, NBA League Pass, etc. since there are virtually no HD options), the comcast menu will freeze when I turn to an SD channel. I cannot change the channel or even turn off the cable box for at least two minutes.  Unpluging the box will temporarily fix it, and sometimes I can fix it by going to an HD channel and back to the SD channels a few times, but by the next day the issue returns.  I've tried swapping boxes and verified my settings are at 1080i/p.  I still own an SD tv as well and there are no issues with it, just the HD TV.  Does anyone have any other suggested fixes?

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