It's sometime difficult to find the reason why. Into a other topic, somebody find the problem was 2 kinds of propeller (renforced and none).
Do you check EACH controller with the full travel of the radio?
Think that probably the DJI is not faulty.
If I have a look onto manual I can see into manual page 26, for atti or GPS mode :
for a double white flash: Status fair
for a triple white flash : Status bad
So where is the problem IF NO OTHER manifestation or problem ??