This is usually caused by either one of the following:
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* System software getting corrupted, can be caused by a system update, not enough space on phone or for no apparent reason.
* Power management chip going faulty (This requires micro-soldering board level repair to fix)
* eMMC chip (Flash memory / a.k.a hard drive) going faulty (This requires either getting the flash memory chip replaced or reprogrammed by a JTAG (flashing box, again like board-level repair).
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If you are lucky sometimes this can be fixed by reflashing the System Software (Firmware) on the phone.
Here is a link on how to reflash firmware on Samsung devices:
This is usually caused by either one of the following:
* Power management chip going faulty (This requires micro-soldering board level repair to fix)
* eMMC chip (Flash memory / a.k.a hard drive) going faulty (This requires either getting the flash memory chip replaced or reprogrammed by a JTAG (flashing box, again like board-level repair).
If you are lucky sometimes this can be fixed by reflashing the System Software (Firmware) on the phone.
Here is a link on how to reflash firmware on Samsung devices:
http://updato.com/how-to/how-to-install-an-official-samsung-stock-firmware-using-odin