Pixellated cloud DVR recordings

Very frustrated as many other individuals are regarding the poor quality of DVR recordings, primarily but not exclusively on network recordings.  Picture is intermittently pixellated, skips ahead, etc.  No problems with any streaming through the X1 box or the smart TV, but completely unreliable and unacceptable quality of picture and sound with the cloud DVR recordings.  Have reset the box numerous times, talked with support who also did this, and am still having poor quality TV recordings.  I renewed and Xfinity replaced the box this past fall, wish I had the old cable box which worked flawlessly.  I spend way too much for cable to have this kind of poor product and service.  Would love to just swap out the box as this only started with the replacement, all connections are good and live TV is perfect, only the recordings.