These types of reception issues could be caused by prolonged driving through a long tunnel or in parking garages may cause a brief loss of signal, while driving in extremely mountainous regions may cause a decrease in signal strength. If these are not the types of terrain or building that you encounter on your day to day driving I would suggest having the vehicle checked by your dealer. There may be something with the vehicle causing this issue. I hope that helps. If you do end up going to your dealer for anything let me know please!
Jeff Morris, Chevrolet Customer Service
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