I've only had my drone a short while and i updated to the latest firmware prior to my first flight.
Every flight since then, it says firmware needs an update and shows i require -  So, i update again and each time it shows me it's successful.  

• Aircraft Firmware:  v01.00.0500
  

But on each and every flight i get the message to update.  Anyone else have this problem? Is there a fix? or is this normal behavior?

Hi, thank you for reaching DJI Forum. I suggest sync the data flight record and save all of the important files from your app to your phone, then to try to un-install and re-install the DJI GO 4 app, if the problem still persist try to go to our website and download the DJI assistant 2. Update the firmware using the DJI assistant 2. Please watch the video below on how you can update the firmware of your Mavic Air using DJI assistant 2.