My mouse goes busy at a specific point on screen.

No doubt you're not alone in blaming Microsoft, Windows 11 was IMHO released far too early given the numerous bugs. I know only too well when I upgraded to Windows 10 I had much the same problem. That operating system installed the wrong audio drivers on my system and destroyed my speakers beyond repair.

As with any system upgrade it's always advisable to perform a full system backup so the user can revert back to the previous operating system should the need arise. Obviously that doesn't help you in your current situation but there is nothing to stop you from reinstalling Windows 10.

As for the other issues you mention, they're not something I could comment on without having witnessed it for myself. I'm certainly not aware of any issues relating to uploading files over the internet.

I doubt you would succeed filing a class action against Microsoft, they didn't force you to upgrade.

SO TIRED OF MICROSOFT AND THEIR ****!!!!

Killing Windows Explorer works for me. I just did all the latest updates today to fix other issues. I was worried when I read others saying an update fixed this stupid issue, because my issue was still ongoing after the update.

I decided update my kid's Lenovo laptop to Windows 11 before touching any of the other laptops in the house. She doesn't use her laptop. It's a good thing I decided to only do hers. Sooooo many problems! Her laptop is only about 2yrs old. Even more lucky for me that her high school gave all students chromebooks to use for their entire high school career. She started a business course, but it's more like a computer course than it is a business course for some reason. It turns out that she REALLY needs to use a computer. It would have been a real headache for me if she didn't have that chromebook! She was trying to upload 2 documents that she had for home and thought she was doing something wrong because it wasn't working, and she's not used to using computers. She was really frustrated. I thought that she was perhaps doing something wrong so decided to help her. She was using her Lenovo, which had just been updated to Windows 11 a few days prior. Sure enough, I couldn't upload the docs to her class either. I thought it maybe a browser issue with Win 11, so tried Chrome, Edge, Firefox. NONE WOULD UPLOAD THE DOCS! I told her to try it on her chromebook and it worked flawlessly. I wanted to roll back to Windows 10, but had just passed the 10 day mark. I WAS SO MAD!!!

Why should anybody have to go through this?! I am the one who helps family and friends with their computer problems. I have to tell the all NOT to update to Win11!!!

Is there any way we could file a class action suit against Microsoft?

The cure is to go into task manager and disable mini search host.I had same problem and disabled it and it cures it.also prevents it happeming again

Like the suggestion I made about restarting 'Windows Explorer' in the Task Manager, restarting the 'MiniSearchHost' is also just a temporary solution. I have since tried both and the issue does return sooner or later, it certainly doesn't prevent it from happening again. As I said it's a temporary solution at best until MS rolls out a permanent fix.

The cure is to go into task manager and disable mini search host.I had same problem and disabled it and it cures it.also prevents it happeming again

The MS article you linked to makes interesting reading, particularly that you can also restart the 'MiniSearchHost.exe' in the Details tab of Task Manager. Obviously the user would need to first 'End' that task and then choose to run a new task from the File Menu to restart that service. A bit more long winded so I'll stick with my suggestion of restarting Windows Explorer.

It's good to know MS have now fixed this issue in the Insider Builds, presumably this will roll out in a future update.