Asus TUF Gaming A15 suddenly shutting down

Hello

I've had this problem for some time, but it stopped happening and it's starting to happen again.

Basically, sometimes when I'm using my laptop normally, it shuts down. It's always the same:
It shuts down --> I try to turn it on --> the start button doesnt work --> I connect it to the charger --> It seems to turn on but shuts down again --> I turn it on again and it works

So far this has only happened to me when the charger isn't connected, but I don't get why. The times it's happened have been:
- Rendering a video from a software like VEGAS / DaVinci

- Starting a game (not an specific one)

I went to check the event viewer, but there aren't any error informs there, and I checked the battery status and it seems to be okay. What the hell is causing this? I can't seem to find a pattern between the times it turns off and what I was doing on my computer. I've also considered stuff like overheating or RAM usage but none of the times it's happened my computer was hot or using too much RAM. Like, it happened just now when I was rendering a 15 seconds video on DaVinci and had turned on my computer barely 20 minutes ago... I don't get it.