Restarting in random moments. New rom needed?

Hello,
I am here because i have another problem with my lovely phone :/
You guys always helped me so i hope you will do it again.

Okay,
My phone is restarting in random moments. Screen is freeze for 1-2 seconds and then rebot. It is doesn't matter if phone is used hard (games) or if it's on the table.
1st time it happend with ROM 5.1.2. Then i've decided to go back to 4.1 rom and then automatic upgrade to 4.3.
Few days was okay and after then it starded again.

Does someone know why i have that issue??

I really hope that is only rom problem and if i change it the problem will gone.
And here's second part of thread.
What oryginal rom do you recomend? I have saw a lot of them but i have no idea what could i install.
Right now i have stock rom, i do not remember exactly number but i has "James Bond" music so i am sure it was one rom from that edition...

Edit:
If you find any better rom than stock 4.3 that is really stable i can take it as well
I jsut want my phone wokrks without any problems :)

Please, halp :fingers-crossed:

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