This might explain his so-called epic meltdown at the iHeartRadio Music Festival in Las Vegas over the weekend. And, according to some sources, it’s long overdue.

Armstrong’s Green Day team — including bandmates Mike Dirnt and Tre Cool— were all part of an intervention to get Armstrong to agree to go to rehab to deal with his abuse of various substances, including both prescription drugs and alcohol.

“Billie Joe has been a loose cannon for a long time,” said a Green Day insider. “It’s long past time when he should be getting some serious help.”

About three weeks ago, Armstrong was rushed to a hospital, forcing the cancellation of a concert in Italy. At the time, the singer insisted he had lost his voice. It now appears that may have been caused by a tough night of hard-partying.

The band has since apologized for Armstrong’s on-stage outburst and will be canceling upcoming promotional appearances while he gets the help he needs.