That always happens when the Internet connection is very low, because the Internet is using many or because the system fell. Even sometimes it happens to me in Steemit.
sometimes I argue with my brothers when they download a lot of things because the internet gets heavy and that happens.
Answer 14 - Good try @veronicasmb I would say it rotates longer with a slow connection, but that is not why. The pot will grow when I finish the overnight comments..