I have 16 desktops with the latest total space. Some times when I working on one space, for example space 3, it suddenly switch to, let’s say space 1. So far I have not observed any pattern yet. But when working withwith Finder+Totalfinder, when I doing file operations on one space, it would switch to another space which also has a total finder window open.
I have disabled Transitions in Total Spaces.
And I googled about space switching, I have left System Preferences - Mission Control - Automatically rearrage spaces based on most recent use unticked.