Reasons actors leave after "mutual agreement" in TV shows:
- Very difficult to work with (second-guessing everything, asking for "more involvement" like director / producer credits, think Wesley Snipes during Blade 2 and 3 and everything after)
- Family (the genuine one, someone's ill, something happened, might happen, wife / husband seeking divorce, your children don't watch your show, come on it could happen to anyone)
- Family (the fake one, like being outed, outing, having legal issues, social media / late shows breakdown or calling out Holywood in general, it's the Kevin Spacey / Mel Gibson one)
- Creative differences (failed attempt to replace director / producer / writer on set with not enough executive power, "it's me or him", said Christian Bale during Terminator Salvation)
- Personal reasons (this one is usually drugs, pills, alcohol, violence, hair, plastic surgery, cult, MMO or sex rehab, "I'm travolting'" he said from some remote Colorado facility)
- Conflicting schedules (some broke polish auteur really wants you tomorrow on the set of his next psychodrame film and your agent is definitive about "your moment, don't waste it")
- Wasn't part of the team (well you DID something to some fellow actor and THAT didn't seem consensual at all, let's just part ways and who are you again? pending formal indictment)
- I don't like it (only works if you're already a Holywood powerhouse figure and your agent did a bad job explaining yours, "it's too confusing" also works well if you're actually very old)