Settings reset to default while the phone is off

It started a few days ago. Phone is almost 3 weeks old. I turn the phone off during night. In the morning, alarm rings, but with default melody.

So, after turning off the phone, and turning it on after a few hours. Some settings reset.

Las time it reseted alarm melody to the default, alarm volume o the default, call ringtone to the default, call volume level to default and storage settings from SD card to internal memmory.

This morning, all of that exept for the volume level, which...

Settings reset to default while the phone is off

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