Warning chimes and tones go silent intermittently, thus not providing audible alerts to the driver of vehicle problems and/or warnings. The problem has been reported and confirmed by a GM dealership. The dealership confirmed that there is a bulletin within the GM system that there is a problem however there is no current fix. This problem has existed for over 10 months of ownership. There is no warning that this has occurred other than there is no warning chimes/tones, only visual indicators.