I am having a problem with losing the binding each time I shut down my RC and my Spark. Each time I turn on my RC and Spark, I have to rebind. Once I rebind all works fine.  Should I be losing the binding, or is something wrong.

Hi, sir. Please ensure that you fly in a place without interference. And you can check if both of the firmware of AC and RC are the latest one. If not, please update to the latest firmware.