On two separate occasions this month, alien hunters say to have spotted mysterious objects showing on their screens before it goes blank.
UFO watcher Toby Lundh lately spotted a UFO outside the space station, moments before the feed was interrupted for 10 to 15 seconds.
Mr Lundh told Disclose.TV that there are 'always some UFOs showing up,' and 'Nasa always cuts the stream when a UFO gets near the station.'
The alien hunter says to have taken a still photo of the anonymous object from the feed - and it looks strangely like the Starfleet insignia in Star Trek.
Professor Andrew Balogh from the Imperial College London Department of Physics tells MailOnline: 'Generally speaking UFO findings are either explained by some artefact effect - even some space junk - or left unsolved as there is not enough evidence.
Nasa is yet to comment on the incidents.
The space agency's ISS live stream and rover photos have become a main source of 'evidence' for conspiracy theorists.
Many scientists believe UFO sightings such as this are down to a psychological phenomenon called pareidolia.
This describes the brain's response to seeing significant objects in random places.