Help Random rebooting and boot loop.

[dtoro93]

I recently rooted my android and eventually ended up unrooting it because the phone sometimes would go into a boot loop after shutting itself off on its own. I have no idea why it happens and it's totally random. It usually happens every other day or so. I have to hold the PWR button when it's looping for it to actually turn on.

Does anyone know why it does this? Do I have to flash my phone?