7/15/16 Update: NASA spokesperson Daniel Huot has commented on this event, explaining that the feed was not cut on purpose but was simply lost, hence the blue screen. It's apparently not unusual for this to happen. As for the UFO? Huot didn't make any statements about it, leaving this case still very much unsolved.
Many videos of UFOs showing up on live NASA feeds from outer space pop up quite a bit. UFO hunter Streetcap1 found the latest, and his video showing a bright object descending near the ISS caused a stir online, even getting picked up by the Daily Mail. Check it out:
People are speculating online that this could be a meteor or space junk, perhaps even the ill-fated Chinese cargo ship Tiangong-1. NASA hasn't chimed in so far.