Default Rom completely randomly stops booting.. any ideas why?

Im using Pound Rom cm11 4.4.2 and stock cm kernel.

but I'm running into this problem:

often when i reboot the rom doesn't boot anymore.

it just gets stuck on the samsung logo with the yellow triangle.

only restoring a nandroid will recover the phone.

but its really annoying i need to restore a nandroid every 2 or 3 reboots.

is this a ROM specific problem, or whats going on?

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