I have taken this quiz 5 times now and passed each time.  It congratulates me each time.  
Do we have to take it each time we  fly or does  updating the Go 4 app triggers it?

I’ve heard that each time you sign in you have to take it. Most people just stay logged in.

Took it a couple of times, but it's now disappeared. Hasn't popped up again.

I took it once and Aced it.  Hasn't come up since then.  Maybe it has to do with the score.  If you get a 100% on the first try it will not come up again.  If not it will keep coming up until you get 100%...  Could be?     

Hi there, normally, if you have passed the quiz when you connect the app to the internet, it will not pop up on the same drone. But if you have more than one drone, you might need to finish the quiz for each drone. And please note that you need to finish the quiz when connecting to the internet, or it might regard as invalid.
Please let me know if you have followed the step and the quiz just keeps popping up. PM me with the app version and the drone's serial number. Thank you.

M.C. Pilot Posted at 2017-12-19 14:39
Took it a couple of times, but it's now disappeared. Hasn't popped up again.

Same here, haven't seen it for a few weeks now.

Hi B1houdini, if you are using an iOS device, v4.1.20 is now released by phase, please kindly update to the latest version if you have received the update notice, it is said it resolved the repeating quiz popping now. See if it helps.

DJI Thor Posted at 2017-12-22 00:24
Hi B1houdini, if you are using an iOS device, v4.1.20 is now released by phase, please kindly update to the latest version if you have received the update notice, it is said it resolved the repeating quiz popping now. See if it helps.

Updated to the latest  iOS  and DJI GO 4 app . Did not have to take the quiz again. All seems good now.

I took it many times and failed, I was forced to sell my dji drone collection

R&L Aerial  Posted at 2017-12-26 11:31
I took it many times and failed, I was forced to sell my dji drone collection

DJI fired one of their Captains lol

Only popped once for me, aced it and it hasn't been back, I have also installed the latest Go app on 3 devices, my phone 1st, tablet 2nd then an older phone I had laying around 3rd. It only popped up on the first connection.

B1houdini Posted at 2017-12-26 10:32
Updated to the latest  iOS  and DJI GO 4 app . Did not have to take the quiz again. All seems good now.

Nice to hear. Should you have any further questions, please feel free to contact us. We'd glad to help.