Raspberry Pi turning off

I’m pretty sure it’s not because of the power supply. Using a 5V / 2A one. I never tried pinging it, but I can’t SSH into it and the remote app can’t connect either. I can try to ping it once it turned off again, but I assume that won’t work either.

I have no USB devices connected and I use the “Turbo” settings from the OSMC settings add-on.

It doesn’t turn off when I’m using it (e.g. watching Twitch streams). It doesn’t matter if my TV is on or off, after idling for about 15-20 minutes it turns off (TV gets no signal anymore and I can’t SSH into it).

Settings->System->Input Devices->CEC doesn’t exist (setting level “Expert”)

Thanks for your time!