I just bought a refurbished WIN11 computer and the Brave browser is doing fine for me.
Yes, I posted a thread about much the same darn thing (Win 10 crash and burn)!
https://freerepublic.com/focus/f-chat/4341085/posts
Unfortunately, while I was able to recover the Brave bookmarks file, my Brave browser on the new machine won’t successfully import it, even tho’ the process seems to proceed just fine. (I have a thread going on that one too, and one with the Brave “Community” forum, as well.)
I do not doubt what you are reporting. I just have not had any difficulties at all with the Brave browser in any of my Windows 10 computers. This might be because I updated all of them to Windows 10 IoT Enterprise 2021 LTSC so that I would keep getting security updates after the October 14 Windows 10 End of Life event, all the way until 2032.
I have done this for friends and family as well, over 20 machines in total. No one using the machines I have updated have reported any issues using Brave or any other browsers to me after getting recent security updates. I have acted as a Chicken Little for months on this forum trying to tell people that they should upgrade their machines. Very few have paid me any heed at all.
This might be another advantage of using Windows 10 IoT Enterprise 2021 LTSC. This might be because this version of Windows 10 is based on Windows 10, version 21H2. The common varieties of Windows 10 are now at version 22H2. There were no obvious benefits to consumers, but Microsoft added crap that was advantageous to them. It is very possible that later non-security updates are intentionally causing the difficulties that you are describing.
On the bright side... Anyone who has not made arrangements with Microsoft or updated their system will not be receiving any more updates in less than 2 weeks. So, this will be a non-issue very shortly.