Production in England stopped on Friday, after Singer was "unexpectedly unavailable" for several days, according to an official statement. In some instances, the movie's cinematographer, Thomas Newton Sigel, had to take the directing reins in Singer's absence.
Singer's disappearances also reportedly caused problems with his cast, including Tom Hollander, who plays Queen's manager and reportedly threatened to quit the film over Singer's behavior.
When the out X-Men director eventually returned to set, there was tension between him and Malek, leading to a fight between the two men. There's also been conflict with Malek, who has reportedly complained to the studio about Singer's behavior.
The pair are not reported to have physically attacked one another during their climactic confrontation, but Singer is said to have thrown an object. Production on the movie, which has been shooting across the pond in London, was shut down on December 1 after Singer did not return to set after the Thanksgiving holiday.More news: Alabama ranked No. 4, gets rubber match against Clemson
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What's telling is that Singer was warned before production even began by Fox Film chairman and CEO Stacey Snider and Fox Film vice chairman and president of production Emma Watts that he was working under a microscope.
Sources tell the publication that Singer's unprofessional behaviour on and off set resulted in multiple complaints to the studio.
Fox is expected to announce a replacement director in the next few days.
Another insider tells the Hollywood Reporter that Singer claims to be suffering PTSD after the tense on-set atmosphere.
Bohemian Rhapsody is now scheduled to hit theaters in December 2018.