I appreciate all the info in this thread. I had a mid 2020 wall connector with the part number ending in -F. I recently moved it up to use 48amp and noticed the overheat and charging reduced message which led me to this thread. I had been charging at 32 amps for almost a year with no issues. I updated the wiring and breaker and got it to 48amp and within a month starting getting the charging reduced message and the blinking red light on the unit.
I suspected my wall unit was a bad one (after first rechecking the wiring and connections) and called and they immediately checked out my info and are sending a new faceplate to me and asked me to send the old faceplate back. Hardest part of the process was figuring out what number to call! I had to work a bit to find the number it is currently 888-765-2489. The options were quite confusing, but I eventually got it right as options: 1, 2, 3, 2, 2, 3. They may change a bit, but you eventually hear a wall charging support line.