Same issue here from day 1. Frequent occurance of the laptop staying in sleep mode when I open it. The only way i can get it to work is if a hold the power button down and then reset it. Also when this happens the laptop gets extremely hot when closed even though nothing is or should be running.). UM433DA- A5016T 14" FHD Ryzen 5 3500U W10. Latest drivers, no virusses, trojans, etc.
I called ASUS Netherlands in january, but no solution other than sent the laptop to Asus. Can't miss the laptop for a couple of weeks, so I hoped the latest BIOS-update would fix this issue, but sadly it doesn't.