I'm not sure if there's a solution to this that doesn't involve extensive manual editing of XML files to keep channel/guide info current, but just in case there is an easier workaround, I wanted to post what I've been experiencing when trying to use the DVR. It's not the behavior I notice every time, but recording shows with the DVR works so infrequently that I rarely try.
This is the most common result, where only a few minutes of a show will be recorded (attached screenshot of 'info' screen). I included the log file, though it does seem to have a TON of extra info, much of it pertaining to some other errors with the TuneIn plugin & retrieving audio content, but all I'm worried about here is what happened on 2/18 around 5PM when I requested this particular recording. I've replaced my local path/username/public URL with dummy data.
Even if the guide is goofed up and it's taping the wrong show...is there any other reason why it'd crap out after recording just a few minutes?