I have just had the same problem on my 2018 silverado with 40k on it. It happened the first time 3 weeks ago. drove it, stopped and it wouldn't start. I jumped it with a jump box and then cables just to make sure.. The dash, lights and radio all come on as normal until i go to the start position, then everything goes off/black and 1 click. As i let off of start position the dash all comes on again. After watching some youtube videos and 2 hours later, i went out to the truck, reached under the passenger front fender and gave a wire a shake (thinking it went to starter) got in and it started.. Probably a total coincidence but never the less it was running. Then 3 weeks passes and it does it again. I waited 2 hours, gave the wire a shake again, and nothing. Got it towed in and luckily it still did not start when it arrived at the dealership and they diagnosed the starter. Here is the kicker, there are no starters in North America and it may take up to 3 weeks for them to get one!! I think they have a huge problem that they aren't telling us!! I work in the auto industry and i know as a parts supplier the pipeline is always full unless there is a big big issue...