Then that is a sleep or display issue, not the Store. You've already tried everything for the store.
When was your last Clean Install, as this may be your best option to get a fresh start. Look over this best tutorial: https://www.windowscentral.com/how-do-clean-ins...
Create the bootable media following the steps under Create Installation Media, clicking to read the link "Before you Start" at https://www.microsoft.com/en-in/software-downlo...
Make sure during the booted install to unplug all other drives, boot the media as a UEFI Device, choose Custom Install, delete all partitions down to Unallocated Space to get it cleanest, choose the Unallocated Space, click Next to auto-create and -format the needed partitions and begin install - this makes it foolproof.
After install expedite all Windows Updates including Optional until no more are offered. Then import any drivers from the PC maker's Support Downloads web page for your model that are newer, or branded instead of generic. The most basic thing we need to learn to maintain a PC is how to keep the latest manufacturer's drivers current. Windows drivers are rarely enough.
Make it a diagnostic install by monitoring for the issue after you reinstall each app, Update, settings or any modifications. Have System Restore points set so you can roll back before the change that causes this, if you isolate it.
Until then you can Go over Windows 11 with this Performance Checklist to try to find and fix problems:
https://answers.microsoft.com/en-us/windows/for...
Feel free to ask back any questions. Based on the detailed results you post back, I will have other suggestions if necessary.
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