What can cause the RFS 3 not to trigger a flash and how can the problem be solved?

Cause 1:
The 2.4 GHz frequency can be disturbed by influences in the environment (e.g. by wireless base stations, by 2.4 GHz routers, by Bluetooth, etc.).
Solution:
Set the studio address to your previous number plus 10. Find a channel without interference.

Cause 2:
Has the flash device finished its recycle? 
Solution:
Please reduce the flash power output or slow down the continuous shooting speed.

Cause 3:
Is the distance between the RFS 3 and the flash device too short (>0.5 m)? 
Solution:
Please position the RFS 3 a little further away from the flash device.

Cause 4:
Is the RFS 3 in a low battery condition?
Solution:
Please charge the battery of the RFS 3.