I’ve had this laptop for maybe 2-3 years now and now all of a sudden the fans are changing how they sound. I routinely clean them every so often, once a month really. They just recently became high pitched now and the temperatures are not even that much different.
I will say that sometimes it sounds like the fans are being hit by something inside of it, when I opened it recently I couldnt see anything obvious so I just cleaned them with compressed air again and that seems to have fixed it but the fans now sound higher pitched than before.