Hi, Jim, welcome to Kindleboards!
I've never come across this problem before!
First question is - is this only happening while you've got the Kindle on charge - if you read normally, does it still happen?
Secondly, did you do the reset while it was still plugged in? If so, try it again with the device unplugged and make sure you're holding the button long enough - even if the screen goes blank you should still carry on holding it for a good 40 seconds.
Let us know what happens!
I've never come across this problem before!

First question is - is this only happening while you've got the Kindle on charge - if you read normally, does it still happen?
Secondly, did you do the reset while it was still plugged in? If so, try it again with the device unplugged and make sure you're holding the button long enough - even if the screen goes blank you should still carry on holding it for a good 40 seconds.
Let us know what happens!