This cartridge is auto-off except under conditions of low or unreliable water pressure, sediment in water, buildup of lime, salt, iron or other mineral deposits, etc., in which case it must be disengaged manually by the user.
Before You Replace It - Be Certain You Are Operating It Correctly
Make Certain it Hasn't Accumulated Buildup and/or Debris
Make certain there is a clearance gap between the diverter knob and the faucet body.