PC: Earlier split of the Roman Empire

Is there a possibility for the Roman Empire to be split into two (or more) states earlier than 395 AD?

I see at least two possibilities, but I don't know how plausible they are :

-The Third Century Crisis is never resolved. We thus end up with an independant "Gallic Empire" in the West, a "Kingdom of Palmyrene" in the East and a rump "Roman Empire" in the Center.

-The Empire splits permanently during the Tetrarchy.
 
Caracalla once had thought about splitting the empire, giving Asia + Egypt to his brother Geta. (But one year later, he murdered him anyway.)
 
Could have started out that way if Mark Antony had been a more successful commander.
 
Mark Antony keeping the eastern half of the empire would had been a nice start but he pawned it off to his children by Cleopatra which didn't exactly make him popular in Rome.
 
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