Cox DVR Blotchiness Like a Streaming Issue

I'm watching the US Open on CBS from the HD channel of my Cox DVR box.      I'm frequently seeing blotchy boxes on the screen as if I'm having a slow streaming issue.    But....I'm not streaming since this is my cable box.    Should have a streaming issue since this is my primary DVR cable box in my house.      

Is this a CBS to Cox issue?     Is this a Cox to my house DVR issue?      is this my DVR having issues?