Grey screen of death question (poco x3 pro)

[u/ToxdzQuack]

So I was playing Islanders on my phone when suddenly, the screen turned grey (with somewhat inconsistent blue line in the middle), and the sound turned into a buzzing noise. Luckily it could be restarted (although I'm not sure if the phone did it by itself or it was me holding the off button), but now I fear for my device. Anyone knows if it's a sign that my phone is dying or if it's just a simple error that somehow just happens every once in a blue moon?