Note to self plug into my friends new 40A circuit, Tesla Gen 3 Wall Connector, at about 45K miles/4 years and 6 months. I verified it would charge at 40A the other day. it would probably be best to charge at 48A for several hours over two charging sessions to verify proper functionality. I have read several posts on various forums where M3 owners have had this fail and replaced under warranty. I wonder if there could possibly be a design error or a bad lot of boards? or charging at the full 48A in very hot conditions causes premature failure? I feel you pain! Wish I had a good suggestion good luck.
Regards, Ron