Same for my 2018 with 25000 miles. Truck sat all weekend and worked fine Monday morning. Went to the store for 10 minutes, came out and just a click. Turned the key about 15 times, wiggled wires, did a dance and started right up. Put it in the garage to inspect, wouldn't start. Battery was fully charged, but I still charged overnight to be sure...wouldn't start in the morning. After about 20 turns with the key, starts right up and I took it to the dealer. It is important to note that the dash, headlights, interior lights all seemed to work fine with no messages about the battery. So now it sits at the dealer with the starter on National Back order! He is hoping it will be in within a 1.5 weeks. In the meantime, my loaner is a new 2020 loaded Yukon.....I can live with it for now, but miss my truck.