I have a 2017 chevy silverado and also have noticed the spotty reception . But I have also noticed that my cell carrier has also gotten worse in the last few months . I use my cell GPS all the time and have never had problems . But now as they try to move to 5g I lose GPS signal in places I have never lost before . I am wondering if the same thing is effecting my OnStar service . Being they are both satellite powered. The GPS and the OnStar signal.