Galaxy Note 2 DN3 rom freezes

Hi, I am using DN3 custom rom on my device but I have random freezes and sometimes my screen is black and I cannot unlock it or turn it on until I restart my device by holding the power button. I was coming from 4.1.2 when i did a clean install of the rom. I flashed the mj5 bootloader too when I flashed the rom.
Any help?

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