I have the original unlighted cover and had been getting spontaneous resets about once every 10 days. I didn't think it was important and lived with it.
Today I visited Radio Shack and my Kindle WiFi was totally disabled. See the description of the problem here:
https://www.mobileread.com/forums/sho...d.php?t=110377
Could the case have transmitted some electrical disturbance to my Kindle WiFi?
I'll mention it to Amazon CS when they call me back.