I spent hours and hours researching and trying different things before I gave up and called tech support.
It is interesting that these ESC errors are occurring on birds that have had no prior symptoms, or crashes. An ESC is a solid state component and should either work, or not. If it works, it should work for quite some time. I'm beginning to wonder if there is some firmware glitch that occurs at a very specific set of circumstances and they have not yet figured out what those circumstances are.
When I had my ESC failure I had 11 perfect flights. Loving life. No crashes, no problems. and then a failure. With my limited understanding or what's going on, this should not happen.
Thinking back on the conversation with DJI tech support, I was informed "Oh, an ESC error, we're definitely going to need to see your phantom." Almost like they were anxious to see it. Wondering how many ESC errors (on perfectly functioning birds) prior to the latest batch of firmware.