Contour occasionally won't pause/rewind

Over the past few months, my Contour box occasionally won't allow me to pause or rewind shows. I get an error message that says something to the effect that, "This set top box does not allow you to pause/rewind." One day it works; another day it doesn't (last night it didn't; today it's working). This is quite strange because I really haven't had this issue in the past.

Has anyone else had this issue?