Samsung J1 overheating problem

I have a Samsung SM-J120M that's rooted with SuperSU and is on stock 5.1.1. The phone feels warmer than usual just above the Home button.
I open up CPU-Z and it tells me thermal_zone0 reaches temperatures up to 49°C (120° F), the battery never goes higher than 32° C (89.6° F), the CPU overheats only when it's not in standby. Oh, and all this is happening while it's 18°C outside my house.

This problem started four days ago, the same day I installed Nova Launcher. So I switched back to TouchWiz, yet the problem persists even after freezing Nova in ROM Toolbox Lite.

I wanted to restart in Safe Mode to see if I could solve the problem that way, but when I long press Power Off, I get no prompt. Even pressing Volume Down at the title screen didn't work (the screen hangs on there Samsung logo). I've wiped the cache partition. My microSD card is fine.

I don't know what else could be causing this.
If you could help me that'd be really great because this phone is very useful to me.

Thanks in advance.

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