My phone keeps randomly shutting off. No lie. Why!?

[TheLovatScout]

Hello All. I was running Mightys Rom (whatever one before the 2/10 release) and I would press the Power Button to shut the screen off. I did this ALL THE TIME and NEVER had it shut off on me. Now, on Mightys 2/10 ROM it does it just when I press it (not hold it, trust me). So I decided to switch to Energyz 2/16 ROM..........Same...thing. Wtf!!! It's extremely annoying since I made it a habit of myself to due to conserve battery power and now its shutting my phone off and I never know. Does anyone know why or if I can change it so maybe I have to hold the power button down for a long time??