I recently purchased a 2017 Volt, and one of the many features I love is the Adaptive Cruise Control. However I got an unusual error message while driving it home yesterday. While the cruise control was on and working properly, a message appeared on the dash saying the cruise was turning off and it was temporarily unavailable. About 20 minutes later I was able to turn it back on. This happened to me once last week too. Do you know what would cause the cruise control to be unavailable?