GTX 1070, Normal Temperature but High RPM Fans

Hi, I have Galax GTX 1070 Hall of Fame (bought it late 2016) and from the last week I have an issue with high RPM fans. I've downloaded GPU-Z and Hardware Monitor software to check temperature and it's showing normal (33c / 91f) but the RPM counter is over 3000 RPM, and a lot of noise coming from the triple fans. I've also have downloaded MSI Afterburner to manually control the fans but I stuck on "'Overclock' is disable on debug mode." I don't know if it's coincidental or not but this issue starts 'regularly' after updating to GeForce 390.77 driver and updating mainboard BIOS to 7A33v39.What's the problem? Please help, thanks in advance.

No I haven't contact them.
Right now I'm using 388.71 driver and with this it looks like solve the issue.

I forgot to mention that I have two 4K monitors, although I only use one monitor most of the time.So I'll just describe all steps I've made, because I'm not sure what step(s) solve it.1. Downgrade GeForce driver (from 390.77 -> 390.65 -> 388.71)2. Downgrade BIOS from 7A33v39 to 7A33v36 (Failed, because it won't accept BIOS with release date older than the one I currently use)3. Reset BIOS to system default4. Use jumper to clear CMOS5. Use another GPU (AMD Radeon R7 260X) to determine if it was the GPU or other issue, the GPU fan works just fine6. Reseted GTX 1070 to another PCI-E slot7. Blows the 1070's fans and heatsink with my mouth, although it looks not dirty8. Boot with essential components only9. And this is the step that, I guess, solves the issue. Connect the 2nd monitor only via HDMI, leave my main monitor (via DisplayPort) unplugged, then boot my PC -> shut down -> plug my main monitor. Strange, I knowThanks for the help.