I know this sounds crazy, and it's very much outdated...
I had the identical issue with my TWC DVR several years ago. I'd alternate hitting the info, guide, exit etc a few times. 90% of the time the guide info would refresh within a few hits of this series.
The issue self corrected in the long term so I only needed to use this method for a few months.
I'm Not an engineer, but I play one on TV. My handle is Tweety but I have nothing to do with the organization of similar name. I just had a really big head as a child so folks called me tweety bird.
