Nate Diaz: Hey, I'm Retiring Too!

Well, UFC 200 has some problems ... as both headliners have apparently retired ... with Nate Diaz joining Conor McGregor on the beach.

Nate just tweeted, "I guess my work here is done I'm retiring too."

There's clearly some kind of a dispute going on ... but we're hoping it's nothing that can't be resolved.