cruise control deactivates occaisionally at highway speeds

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at highway speeds engine hiccupts and cruise control deactivates.its rare and has happened 6 times between 5000 and 11000 miles of use. at 10000 miles car was serviced by dealer and the motor/ system computer was reflashed. at 11000 miles car hiccuped twice within a few miles at highway speed. driver can not tell if motor hiccup caused the cruise control to deactive or if the cruise control deactivation was the cause of the apparent hiccup.