If you really get a bad PW or the replacements are also bad, it seems the best answer is return it for a refund.
Maybe by January, 2013, all the problems will be resolved.
I had heard that Foxconn in China had all their QC workers walk out. I have a hunch that somehow this may be connected to the PW problems.
My Paperwhite seems great to me but it seems like lots of others are really getting bad units now.
I just hope my 32 Gb Fire HD comes in reasonable shape. If not, I won't request a replacement. I will just send that one back for a refund.