Allview A5 Duo Restarts after flashing ROM topic

So, I have flashed many ROMs on this phone. As most of them worked , some of them had problem where when I entered the camera or flashlight my phone would restart. And now I really want to know what is the problem as it became pretty annoying. Allview A5 Duo is the romanian equivalent of the Gionne P2 and Walton Primo F2 , as I saw from my searches. And some of the ROMs which have the camera bug on my phone on those phone works. So if someone could help me It would be awesome. ( and sorry if I didn't post this where I should have, I am a begginer here ^^).