I had similar issue with my 2023 Canyon Denali with 247 miles on it. Drove it all day and parked it. Next day nothing. Called the roadside service who got it started, but screens were blank and power brakes weren’t working. They towed it to dealership. They worked on it all day and finally called around 5 pm and said it was working fine. Told me that it was possibly the courtesy lights didn’t go off or maybe I hit the start/stop button twice and put it in accessory mode. When I picked it up I was speaking with the GM there and he said “what”!! He said it didn’t sound right so he told them to just put a new battery in. Working fine now. We were wondering if it was caused by my truck that reportedly built by 1-26-23 was sitting for 6 months before it was shipped. I guess we’ll never know!! Love my Denali!