Hello,
As of a little over a week now, running qBittorrent for a while causes my computer to eventually begin stuttering, lagging, and becoming non-usable necessitating a restart. Since this was only happening after opening qBittorrent, I incorrectly placed the blame on that app. After coming across several other users on their forums running into similar issues, the common trend turned out to be that everyone was also using Malwarebytes; when Malwarebytes is turned off, the issue immediately resolves itself (without even necessitating a reboot, which was previously the only way to stop the lagging/stuttering).
For reference: https://www.reddit.com/r/qBittorrent/comments/g9dlto/pc_lagging_recently_and_you_think_it_is_qb_do_you/
Sad to see yet another once-good app become unusable due to feature bloat.