Hi,
A few weeks ago, my anki randomly started to not load up on windows, after trying to download every version i could, I downloaded the 2.1.60 Qt6 again for the fifth attempt and it worked. It now is not loading up again.
If it randomly stops working and a re-install fixes it, that seems to imply something is modifying/removing one of Anki’s program files, such as an antivirus program.