My phone always randomly turns off, I would be texting someone and then it would (sometimes) flash and then turn off and...

Try to hard reset ur phone however this will lead to everything deleting so take out ur sim and memory card and turn ur phone off, hold the power button and when phone vibrates hold the volume button down, this should lead to a triangle with '!' In the middle this means ur doing it right... When it does this, press... Volume up Volume down Press the power button Then volume down Ur phone will now restart and everything should be brand new