It seems like whenever someone posts with this issue, several people swear it’s the overexposure warning and then it turns out to not be that. The overexposrure warning doesnt even look like this, but people still say it. Eventually a few people note that when it happened to them, it was cured with an OEM ribbon cable. Only OEM.
That's the one - make certain that it's a OEM DJI ribbon cable, and not a knock-off!!