Michael:With the popup set to OFF (---) in commander mode, it still fires: 1) During the shutter closed preflash sequence that is used to establish power levels for the remote unit(s).2) A low power pulse while the shutter is open, signaling the remote unit(s) to fire for image capture.How long does it take for the ready light to come on in the remote speedlight when the slowdown begins?How long is the pause when the slowdown begins before it resumes operation?From a cold startup, how many shots can you fire before the slowdown occurs, and over what time interval?Is it possibly a buffer full issue in the camera? What is the capacity of the storage card you are using, and what is its speed?Can you test the remote speedlight on another camera? If it works there, this suggests a camera problem of some type.Can you test another speedlight on your camera? If this works, it suggest a speedlight problem of some type.Let me know what additional testing reveals.Regards,HBB in Phoenix, ArizonaNikonian Team Member Photography is a journey with no conceivable destination.
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