In digital video, a missing or corrupted signal may result in glitches in the video. It can be caused by things like signal interference, scratches on Bluray discs, bad weather with satellite TV, damaged cables, Internet link congestion, etc.
Flat-Earthers like to scrutinize videos taken from space. If they find the glitches, they will swiftly use them as “evidence” of manipulation. In reality, such glitches in the videos are not unusual. We can easily encounter them on other occasions.