We are having difficulty connecting to your contour box

We have the Contour system and we repeatedly get an error message saying "we are having trouble connecting to your Cox digital receiver".  When the message pops up we cannot change the channel, the TV is locked on the current channel we are watching (very frustrating).  We have had several techs come out but the issue continues to persist.  Last visit included the running of an independent line outside of the house line. I'm wondering if this is a Contour specific problem?  Does anyone else have these issues?