Flash issues with Astro Or Miami
Remember to change your transmitter's BATTERIES over time!
Make sure the SYNC CABLES are fully plugged in!
Make sure your transmitter and receiver are on the same channel!
If other electronics or photographers use the same channel frequency as your booth it may start flashing like crazy without taking pictures. If so CHANGE THE CHANNEL TO ANOTHER ONE !!
Also, make sure to check the batteries on the wireless hotshoe.