Input on HDTV Keeps Changing.?

Hey, I have a Time Warner HD DVR Cable box and recently on all the HD Channels it has been changing to 720p instead of being on 1080i. This has only started happening recently. I can go in and change it back to 1080i, but when I press save it goes back to 720p. If anyone has any ideas they would be appreciated.... show more Hey,
I have a Time Warner HD DVR Cable box and recently on all the HD Channels it has been changing to 720p instead of being on 1080i. This has only started happening recently. I can go in and change it back to 1080i, but when I press save it goes back to 720p. If anyone has any ideas they would be appreciated. I'm saving a call to TW as my last resort.

*I have a Sharp HD TV.
Update: Thanks I will see if I can find some settings. I'm just not sure why it all of a sudden started doing it.
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