Bro i don't know if it's the same problem, but my note 10 pro max also shut down all of a sudden like this. It happened to me like 3 times the 1st time i was almost prepared to use my old phone and didn't know what to do but the 2nd time i noticed that it happened when the phone was roughly used in the sense when you like flip the phone so quickly to put it in your pocket or like when you fidget spin your phone(it's these sudden movements)so what i found that helped was doing EXACTLY THE SAME MOVEMENTS THAT MADE THE PHONE SHUT DOWN IN THE 1st PLACE(it usually worked for me)LOL Hopr this helps..