M.I.A. cut ties with her record label Roc Nation last week by abruptly notifying fans via Twitter. “I’m leaving . . . Thanks to everyone who supported the . . . LP.”

Her relationship with Roc Nation, home to Rihanna, soured last summer when she said her album “Matangi” was needlessly delayed, and a documentary on its making was pulled by the label after director Steve Loveridge leaked it online.

Loveridge respond­ed by telling Roc Nation brass, “Count me out. Would rather die than work on this.”