Programming changes

I have programmed shows to record and then find out the programming changed and an entirely different show was recorded.  Now, when I had TIVO through DirectTV long ago, that was the best box ever.  It was intuitive.  It knew what was on when and adjusted accordingly.  Also, if you turned on a show midstream and decided to record it, it would revert to the beginning for the recording.  Then that box got phased out and nothing has ever been the same.  I am really unhappy with the guide currently and the problem with different shows playing other than what's stated on the guide.  I notice this especially with CNN however, the show should not record at all if the program changes.  Seems that these issues can be fixed with a decent box.  I know the technology is there.  Is Comcast just being lazy.  I care less about all the new things I can speak into my remote.