Legion 7 Pro Fan speeds

Hey guys, it's been 2 weeks since I ordered a Legion 7 Pro 2023 with RTX 4090 variant. Due to the lack of time, i didn't have the time to strech the legs of this beast, but from what I saw, in the first week, the laptop was very quiet, especially when running on battery (the fans used to kick in rarely). When plugged in, the fans are a bit louder, but for daily tasks, the laptop works perfect even on balanced mode. After a short usage break (a few days) and a bios update, the fans are more louder, even on quiet mode and when running on battery. Even though the laptop is in idle, the fans are rotating at a low to medium speed and I don't know why it's doing that, it's a bit disturbing, compared to the last week. Also, they don't stop, they're running constantly, and i'm not doing something very intensive.
I don't think that it had enough time to fill with dust, also, it stayed in my backpack when i didn't use it, and each time when i worked on it, it stayed on my desk. Are there any other owners who encountered this issue? Should be caused by that bios update?