Problems with DVR playback

For the past few weeks we are having issues playing back recorded shows.  The stream will pause/resume a couple times and then hang.  Eventually a message comes up stating the was a problem playing the recording and it is available on OnDemand.  This happens at a specific point in the recording and is repeatable on both the Roku streamer as well as on the PC.  Stream will hang at the same spot on all devices.  The Today Show seems to be a particular problem, but happens on all shows and channels, usually daily at least once.