Discussions about these sort of things with abrupt cast exits and the like always bring to mind the West End's late, great Martin Smith and his one brief career misstep when he was cast as the Phantom in 1989 and was in the role for just about 2 months before disappearing from the show mid-week.
I did an extremely detailed write up of available information about this but it's a bit long to post here, so I'll link to the reddit thread I wrote it for below
