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I recently updated my Samsung Galaxy S4. Since then the phone keeps crashing every few minutes. When I restart the phone, it works fine for a few hours then again starts crashing.

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    What carrier do you have? Are you rooted? – Gryphoenix Feb 12 '15 at 14:13
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install a custom recovery like philz touch, completely wipe, then flat the firmware for your phone downloaded from live.samsung.com. Did you face any call quality issues?

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