Here's a youtube video that I think might help shed light on the issue. (just to give everyone an idea of what actually might be the cause of this)
My T3 did eventually start charging last night, but it was when I plugged it in after midnight.
if my theory is correct, the power gets cleaner later at night, generally speaking.
I plan to borrow my friends oscilloscope this week, and post pictures of what the power looks like when the car refuses to charge vs what it looks like when the car does charge.
In that youtube video, the cleanest power he got (other than his grid power) was that honda generator.
Generating power from a spinning generator is actually the easiest way to get a correct sine wave, after all, it's how the utilities do it as well.
Basically, some of us are too far away from our substations, and our sine waves are too "elastic" from the main grid. Uneven loads on our leg off the substation are causing imperfect sine waves, and our Teslas, likely due to changes in the software, are just too sensitive to these imperfections.
Imagine there is a 300KV to 7,200V substation 5 KM from your house. The 7,200V run off that substation that powers your house also powers a commercial / industrial area.
Maybe one of those businesses is running a plasma cutter, or maybe a bunch of laundry driers with pulse width modulated heating element control.
These types of loads can cause the sine wave to "chop up", kind of the same way wind can cause the surface of a lake to become choppy.
The further away the load is from the substation, the greater the effect on the sine wave, because of the resistance in the utility wires.
The fix is either going to have to be a software workaround, or us proving to our utility companies that the power they are supplying us is "dirty" and hopefully them doing something about it.
This is still a theory, but hopefully once I get a scope setup, I can provide some more evidence. I feel the traditional "voltage drop", "resistance to ground", "bad breaker" theories have all been beaten like a dead horse here. Furthermore Tesla themselves are not accusing any of us of having wiring faults in our homes, but rather actually pointing to dirty power from the utility and software.