this is NOT an addon issue. I did a clean install, removed all addons and addon managers, and used all of the UI reset commands to no avail.
I managed to reduce the incidence rate by setting my mouse response rate to 125 hz. This does NOT eliminate the problem, it simply reduces how often it occurs. It is absolutely insane to see how many people report this issue while considering how badly it affects gameplay, yet all support staff have to offer is “check your addons and file a ticket.”
Come on.