That means the fan is working too hard, and the PS4 is likely getting too hot, putting it at risk of hardware failure. Don't put off cleaning the hardware, especially if it is more than a year old ...
Fortunately, PS4 controllers aren't particularly difficult to clean when you have the right supplies. It's not all that different from cleaning a PS5 controller, but as always, patience and a bit of ...
2TB Seagate USB 3 external hard drive - also a former backup hard drive - $10 PS4 - white with two controllers ... Could use a pretty good cleaning, but functions fine. Bought for $1200 in ...