Several users have reported an issue in which the cursor moves unexpectedly and without user input under macOS and Mac OS X. In these cases, the cursor may continue to move even when the mouse is physically disconnected. Users report that the issue remains after switching mice both wired and Bluetooth. Readers say that the problem persists even when you change surfaces, giving evidence that this is a software-related issue.
One reader writes: “My mouse cursor moves randomly around the screen, usually all the way across and almost always to one of the screen corners, in which I have hot corners enabled.”
Although this problem is generally innocuous, it causes significant issues in some cases, including inadvertent scrolling of web pages or accidental file selection/deletion (if the cursor unexpectedly moves as a user is attempting to interact with a specific file).
Cursor Moves Randomly: Possible fixes
- Although anecdotal evidence suggests that, in most cases, this is not a mouse surface issue, placing a white sheet of paper underneath the mouse helped some people.
- Some users have also reported that turning off secondary displays mysteriously resolves this issue, albeit not a viable permanent workaround.
- A few users have reported at least temporary success with resetting PRAM/NVRAM.