Well I allowed the update for the Go 4 (4.2.5) this morning (Australai) and later  in the day went to do a flight, what a disappointment.
Hadn’t done the latest iOS update (11.2.5) due to the forum warnings, see my issues listed below.

Couldn’t get connection between camera and iPad.  Turned everything including iPad on and off at least 4 times

When I finally got ipad connection to  the camera and then the I had camera gimbal go limp  (no viagra joke pls)

After I finally got everything to look like it was working, I got my drone started and let it hover about 3 meters of the ground and it looked like it was riding in a rodeo, wouldn’t hover still.

When I tried to land it it behaved like it was getting delayed inputs of about 4 seconds from the controller.

This is the first time I have had issues with any of the updates, will now see if I can go back to the previous version of Go 4 firmware.

Arwon, please ensure that there is no interference around your drone. I would recommend you clean up the cache files in your device. Thanks for your support.

DJI Elektra Posted at 2018-2-10 23:36
Arwon, please ensure that there is no interference around your drone. I would recommend you clean up the cache files in your device. Thanks for your support.

Many thanks for the reply.  There was no interference as I was on a property that has now power and have flown there before.
Will clear the cach and see how that goes next time, thanks.  

Arwon Posted at 2018-2-11 12:34
Many thanks for the reply.  There was no interference as I was on a property that has now power and have flown there before.
Will clear the cach and see how that goes next time, thanks.

They always give the same crappy replies over and over, Please make sure there is no interference, make sure to clear your cache.. make sure there are no trees, no buildings, what do they think were all stupid!!!

4.2.6 is out now maybe this will help.