As far as official news/ medical documented incidents goes there is not a specific incident. However, I just visited in September for Rock the Universe, and Doom was closed. I then proceeded to speak with a quote on quote "imagineer" of universal who was on site outside of the ride who told me "We have decided to bring it out of commission for about a month or two as it needs many repairs at a rate of about 7 system crashes a day and many safety/mechanical issues. We really rode these issues out for as long as possible. Sorry for the inconvenience should be opened by your next visit."