Hi EPeterik, hope you're doing well. I'm Ian, and I'm happy to help you today.
Windows 11 includes a feature called Fast Startup, which is similar to hibernation. When you select “Shut Down” from the Start menu, it doesn’t perform a clean restart. Instead, it saves the operating system state to a file called hiberfil.sys, allowing for faster boot times when you power up your PC again. To disable Fast Startup go to In Control Panel, select Power options, and then Choose what the power buttons do. Then uncheck the Turn on fast startup checkbox.
This is a user-to-user support forum, and I am a fellow user.
I hope this helps, but please let me know if you need anything else.