The upper stage of Rocket Lab’s Electron launcher appeared to tumble just after engine start, following shutdown and separation of the Electron’s first stage.

The upper stage engine then appeared to cut off. Rocket Lab has ended its launch webcast.https://t.co/yjFcazbPGG pic.twitter.com/fcxAxuXcHj

— Spaceflight Now (@SpaceflightNow) May 15, 2021