GetSchwifty
Devilish Hamster
Undocked. I never play docked mode. Purely handheld for me. - It isn't so much that the fan is "loud" from overheating or anything. It sounds more like there is just some general age to the mechanism, and it makes a little rattling sound when it spins too fast. It usually calms down pretty quickly...but games like TotK and Pokemon Violet make it spin pretty quick upon startup.
Yeah okay, that could explain it and I also know what you mean then.
There are 2 occasions when this happened for me: Diablo 3 (I notice the fans after a while in handheld mode) and The Stanley Parable. In The Stanley Parable my fans got so loud and my system ran so hot (docked!), that I actually quit the game and uninstalled in fear for my console.