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3 days ago, my phone started freezing very often. I would hold the sleep and home button for 6 seconds to restart it. After a while, it started turning off and on by itself. Just last night it had this lit up black screen. It was totally upresponsive and my iPhone did not show up in iTunes. I let the batter run out and than I charged it. It was fine for a couple of hours and than it started turning of and on by itself. It worsened to the point where right away when my iPhone 4 turned on, it turned off. Now it has a blue screen. Pressing the home and sleep button doesn't hel. It doesn't show up in iTunes either. Should I wait for it to run out of battery like last time? What can I do in the future to prevent my phone from freezing and turning off. Will upgrading it to the newest operating system help? This phone is nearly a year and a half old. Please help.
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these steps in order until the problem is resolved.
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