Interrupt a TV... Help

Have had UVERSE for a number of years.  I have 5 STB's.  For some reason, On one of the STB's it continuously asks me to interrupt a TV to view HD tv.

At first, I though that other STB's were on.  I went through the house to verify, and they were not.

Only 2 STB's are on, and no recordings are happening.  The interrupt query comes on anytime I change channels (either directly or through the Guide)

Has anyone else had this problem.  Anybody notice a software update?