I have 2015 Highlander power tailgate does not work. When you push button, it beeps but does not open. Read online if window does not shut tight then hatch will not open. Opened rear window, physically latched window lock with window open. Hatched worked as it should. Closed window and operated once fine, then did not operate the second pass. Repeated above steps, and worked again. But failed soon there after. Any ideas?