I don't think it is about the boards being 5v. From what I have pieced together there is a problem with some boards failing due to static electricity. I don't know why some boards fail and others don't but my understanding is that JJP will extend the warranty for these board failures.
Ed- If you have been waiting for a board that long I would drop Lloyd a call and email.
I started using this product JJP recommended called Mist-n-shine. It claims to decrease static electricity. Not sure if it was just coincidence but after starting to use this product and using the line conditioner my game has been working.