Have a 2016 Chevy Silverado 4WD Z71 5.3 V8 and had the service 4WD light come on a couple of times, it would go away so I scanned it and no codes. Truck then shifted into 4WD a couple of times automatically. Scanned it again at the dealership and nothing. Ran it through a series of putting it in 4WD and then back to 2hi and no probelm for a week now. Any solutions or things to worry about? 76,000 miles and 5 years old.