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One of YouTube's most popular and long-running videos has briefly disappeared.
The live stream – known as "lofi hip hop radio - beats to relax/study to" – has become one of the site's best-known videos.
As its name suggests, the live video offers a rolling playlist of relaxing songs that are intended for people to listen to as they work. That is played over an image of a person known as "study girl" – a looping image of a young woman who is working.
The feed has been watched hundreds of millions of times and is the most famous of a genre that makes up a large part of YouTube, with a variety of different videos offering their own takes on the format.
But the original video briefly went offline over the weekend, and users were unable to access the feed.
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14/25
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
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The giant human-like robot bears a striking resemblance to the military robots starring in the movie 'Avatar' and is claimed as a world first by its creators from a South Korean robotic company
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Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
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Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi
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Dmitry Rogozin/Twitter
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11/25
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty
12/25
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty
13/25
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
14/25
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
15/25
The giant human-like robot bears a striking resemblance to the military robots starring in the movie 'Avatar' and is claimed as a world first by its creators from a South Korean robotic company
Jung Yeon-Je/AFP/Getty
16/25
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
17/25
Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi
Rex
18/25
Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi and Kaptain Rock playing one string light saber guitar perform jam session
Rex
19/25
A test line of a new energy suspension railway resembling the giant panda is seen in Chengdu, Sichuan Province, China
Reuters
20/25
A test line of a new energy suspension railway, resembling a giant panda, is seen in Chengdu, Sichuan Province, China
Reuters
21/25
A concept car by Trumpchi from GAC Group is shown at the International Automobile Exhibition in Guangzhou, China
Rex
22/25
A Mirai fuel cell vehicle by Toyota is displayed at the International Automobile Exhibition in Guangzhou, China
Reuters
23/25
A visitor tries a Nissan VR experience at the International Automobile Exhibition in Guangzhou, China
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24/25
A man looks at an exhibit entitled 'Mimus' a giant industrial robot which has been reprogrammed to interact with humans during a photocall at the new Design Museum in South Kensington, London
Getty
25/25
A new Israeli Da-Vinci unmanned aerial vehicle manufactured by Elbit Systems is displayed during the 4th International conference on Home Land Security and Cyber in the Israeli coastal city of Tel Aviv
Getty
A tweet from "Chilled Cow", the largely anonymous creator of the video, showed a message apparently set by YouTube's administrators that claimed the feed might have broken the site's terms of service and that the channel had been "terminated". It also said that the user would be banned from setting up any other YouTube accounts.
That led to worry among the feed's many fans. A flurry of tweets expressed upset that the video had been taken offline and hope that it would come back up again.
Others joked that perhaps the person in the video, known as "Study Girl", had finally finished her homework.
But soon after that, the ban appeared to be reversed, and the live video is back online with the same name.
YouTube and its owner, Google, have not given any public confirmation of why the account was taken down or which part of the terms of service it is thought to have broken. A spokesperson did not immediately respond to a request for comment.
Many of the music videos take other artists' songs and artwork, and so can be punished for copyright infringements, and the videos have also been accused of using YouTube's algorithm so that they regularly appear as recommended videos.