I had the same type issue with an HP Laptop 15 from 2019 with Win10 Home and Upgraded to Win11 that I was given for parts, worked with it awhile. When the screen flickered at startup I would hold the power button down for 8-10 seconds to do a full shutdown, start again and it worked perfectly until the next power feature kicked in. It has the Intel Iris Plus Graphics adapter, driver version 26.20.100.7026 from 2/25/2020. Finally on Sunday I wiped the drive completely, installed Win10, updated it then did the Upgrade to Win11, problem hasn't recurred since.
Edited to add driver version number.