Quite the unfortunate issues you're encountering. I'd be pretty frustrated too!
Did you uninstall any software that came installed from the factory? If so, please list them here.
Also, if you added any drivers or tools sources anywhere except MyAsus or the Asus website for your model and OS, such as Intel drivers or software for your screen, third party pen/inking, etc. Please list those and/or simply try uninstalling all of them and checking for experience after a clean reboot.
Lastly, are you running any antivirus, anti-malware, randsomeware, etc. software? If so, please list those here.
Your problems, though seem directly related to power at first glance, may be related to any of the above - or even more. This is a great first place to look, i.e. attempting to return to as close to factory settings as possible without a factory reset. If you are comfortable with the data loss and work involved in a factory reset, that would be the fastest way to diagnose root software or HW issue for Asus to solve on your behalf.
If it works as expected after your factory reset, make one change at a time, test the experience, and repeat until you find your culprit ;-). Sometimes it's a combination of things like virus protection and say, a screen configuration suite.
Much luck and please post your results if you find the root cause to help others avoid the same problem and/or potentially have Asus update firmware or driver's to remediate.
My very best,
Hopefully helpful 😄