Service Unavailable Reference 3.1.1.1

On Monday at roughly 8:40 PM PDT in El Cajon, CA I started receiving the error "Service Unavailable" (Reference 3.1.1.1).  It has been affecting many HD channels and occasionally some standard channels.  Most notably and consistently 1005 and 1008 however their standard counterparts today seem unaffected.  As noted is was random last evening and hit many of the channels but today it appears to be just just two.  I have the same results on both of my HD boxes.