Random target changing happens to me all the time on my elementalist. Even with the option ‘autotargeting’ off and the option ‘Promote skill target’ on i keep switching targets if i use tab targeting. As long as there are more then one hittable objects in my screen i keep switching targets. I feel only safe to cast when i angle my camera in a way that i only see one target on my 24" screen.. I never had this problem on my ranger(80) before. Very annoying.