Could someone with a Kindle that is experiencing the crash issue test this:
Kindle's Settings -> Developer Options -> Advanced
Toggle "Force GPU Rendering"
If you don't see Developer Options:
"On Android 4.2 and higher, the Developer options screen is hidden by default. To make it available, go to Settings -> About Phone and tap Build Number seven times. Return to the previous screen to find Developer options."
Does that fix or reduce crashes?