Help with macro

Why does this macro stop working/doesnt work?
Prior to adding berserker rage it worked as intended but than stopped/hangs..
/startattack
/castsequence [combat] reset=combat Berserker Rage, Bloodrage, Battle Shout, Mocking Blow, Demoralizing Shout
/castsequence [combat] reset=combat Thunder Clap, Heroic Strike

/startattack
/castsequence [combat] reset=combat Bloodrage, Berserker Rage, Battle Shout, Mocking Blow, Demoralizing Shout
/castsequence [combat] reset=combat Thunder Clap, Heroic Strike

why are you using this macro