I would like to continue monitoring this thread. I also have had 3 displays replaced under warranty. The last one just 3 days ago. I also have it plugged with the original power brick into a high-end 5500 joules power filter. My first screen was running firmware v40n, the second v40o, but the new one, I didn't see when it started.
I have 2 dead touchscrrens that Acurite (or Chaney) didn't want. Though it will be almost impossible to figure out what is wrong with them I am going to try to troubleshoot the basics. I am inclined to believe this is corrupted ROM where the software resides, so the only way to repair it would be with another ROM chip soldered in the place of his one. There are several reasons why the design may have a read only chip, but definitely I would have thought that you would ensure it is flawless before you put it on thousands of displays that you will sell for $100 ( I don't feel a $100 is a disposable product for home use).
You all have a good evening and good luck with your displays.