Uverse live tv pixelating/freezing when DVR is recording

This started about a week ago. When our DVR starts recording a show, all channels on Uverse become pixelated and/or freeze. We cannot watch tv. The show that is recorded is also pixelated/frozen when we try to watch it the next day. We have a brand new Uverse receiver (the tech support thought that was the problem) but it continues to happen.