REK11: fakt je to tak a je to dobré vedieť, keď napríklad sem-tam zamrzne obrazovka:
Amazon.com Help
http://www.amazon.com/gp/help/customer/display.html/ref=hp_200127470_frozenscreen?nodeId=200829000#restart
Kindle Tip: Restart Your Device
Restarting your device can resolve issues like a frozen screen or problems downloading content.
Press or slide and hold the power button for 20 seconds.
After 6 to 8 seconds, the screen will go blank. This is normal. Continue to hold the power button.
After 20 seconds, release the power button. The charge indicator light will turn on after a few moments. For Kindle Fire, press the power button again.
If you have successfully restarted your Kindle, you'll see the start-up screen.