Well, the good news is at least Amazon has not said this is normal variance and these units are performing within normal specs!
If there's no fix, they can just replace units for unhappy customers and change the design for new improved pw 2 without ever acknowledging there ever was a problem. The pw is selling like hot cakes and most people are happy with their screen. They don't need to lie. They just need to keep mum.
So I think they do have a fix, or at least they think they have a fix. I think it's a problem that crept up when they went to mass production. It's going to take a little time to implement it.