I put it on the vertical stand and set it out in the open, just to make absolutely sure that not having enough "space to breathe" is not the issue. Barely made a diffrence. When I start up Bloodborne, it starts off only semi-loud, and as soon as I fight Father Gasoline, it goes full blast. It does slow down a little when the fight is over (i.e. I am dead) though. Everybody's Gone To The Rapture is still pretty much constant jet engine mode. Real bummer, as the game's mood is so quiet and peaceful. MRU, have you tried Rapture yet? Does your PS4 stay quiet?
I just took the vacuum cleaner to the air vents today, combined with quick strong bursts of air into the system to knock stuff loose. I didn't *see* any dust coming out, but hopefully it helped a little. Will test tonight, once the apartment cools down a little.
A month ago, we had our bathroom renovated. I suspect the construction work (tearing up wall and floor tiles) released a lot of fine dust into the air, this may be the culprit. Then again, I have read many reports of other people's consoles acting like mine, so it doesn't seem to be too uncommon. Opening it up and wiping clean the fan blades supposedly does wonders, but I don't want to remove the factory seals on my limited edition...