I recently had my Ubuntu Linux upgraded to 14.04, and my emacs got upgraded to 24.3.1 in the process. I noticed that it scrolls by itself. I finally realized that it automatically centers the cursor vertically after a few seconds. This is extremely annoying to me. I decided to give it a try for an hour or so to see if I can get used to it, but it still annoys me. I went to the options menu, but I see nothing about that feature. Can anyone tell me how to disable it? Thanks.
Try to start with
emacs -Q first and see if the problem still exists (it should not). Then bisect your init file to figure out what causes it.
centered-cursor-mode as a global minor mode to keep the cursor vertically centered, but it behaves somewhat differently than what you describe. Your best bet is to bisect your init file (comment half of it and concentrate on the half that appears to be responsible, then repeat on that half until you are at the line that causes the undesired behaviour).
Please check this answer to a similar question.
Try killing any buffer-list buffer.