I’ve been having lots of week signal and video feed problems with the released firmware update.
https://forum.dji.com/thread-127433-1-1.html

Seems I finally got the Beta 01.05.0301 working.
I’ve tried updating & downgrading numerous times with both the controller iPad and with a PC.

Had the Beta on board & was having lots of video feed & signal problems.

Weird solution though:
1. Everything turned on as usual.
2. Format SD card in DJI Go 4.
3. Downgrade firmware using Assistant on a laptop.
4. Updated firmware to the using Assistant on Laptop.
5. Restarted everything.
6. Format SD card again.

Found this in my notes from a couple updates ago.

Did a 15 minute test flight. No signal or video feed problems.
Haven’t tested everything of course, but the major problems seem to be resolved.
Even with Cache while video recording turned ON, my iPad Mini 2 was fine on this test flight.

Maybe your solution will help a lot of users with the same problem ,still sounding strange , well done !!