I bought a Samsung Galaxy Tab 10.1 two weeks ago. Five times in four days it suffered the so-called "Sleep of Death". In this problem, this Smartphone itself will not ring and cannot be revived from sleep mode. I'm very dissatisfied with this Smartphone. I need to fix this problem in any way. I hope many people have already fixed this problem. Android OS present on it. Then suggest what process needs to solve this problem. Thanks for any help.