Well I just got through with May Day then a Kindle Specialist. My HDX is showing a flickering when I am in Books. It doesn't happen when I am reading a Doc or when I am in Mantano or any other part of the Kindle just when I am reading a Book. Non Amazon or Amazon.
It reminds me of the CRT monitor flicker if you are old enough to remember one. They downloaded my logs and are going to look into it. I could tell they were stumped. Me too.
Replacement will be here on Monday.
Now here's the kicker! When the May Day window was up it didn't flicker at all but as soon I closed it the flickering started. This just started today and I restarted three times, Turn auto bright on and off it still happening so either I activated a bug lucky me or My device is defective.