Hi there, I was going to open a thread to talk about it, but decided to reply here. The same thing is happening to me. My computer shuts down out of nowhere while playing BG3, it doesn't overheat, I tested harder and stronger games on max and nothing of the sort happened. The PSU is fine, it doesn't get over 70° neither in my CPU nor my GPU, yet out of nowhere while playing the game, the pc just shuts down. Toning down the graphics only delayed the inevitable, and sometimes, things just happen at random: One session I played hours with no problem, others it was nearly right after starting the game. Sometimes all it took was asking for a character to sit down, others it was during an intense cutscene.
I tried nearly everything, from undervolt modes for the GPU to energy saving modes for the PC, nothing works.
Anyone found anything about this problem?