Because you are reading conspiracy websites a lot.
Nonsense, says NASA.
“We have never seen UFOs in the popular sense,” a NASA spokesperson told Popular Mechanics. “The feed in question is the High Definition Earth Viewing experiment. Anytime the ISS has a signal, that feed is sending down video.”
And anytime the ISS loses that signal, the stream goes dark.
“The feed is not switched manually,” the NASA spokesperson added. “It’s all done automatically. There’s nobody at a control board. We used a space-based data relay network. It gives us a very good coverage area, but you do lose signal occasionally — anywhere from a couple of seconds to a couple of minutes. It varies from day to day.”