Hi Jeff,
Not sure if it will help, but first off make sure to check and resave the fan settings to auto and check the settings for drive hibernation. The other thing I have noticed is that in my environment, if I position the unit so as to have a wall or other hard surface close, withing a foot or two, the fan seems to be louder. Whereas if I can re-direct the exhaust in a different direction at an angle to the wall and at 4-5 feet away the noise is dramatically lower. Worth a try if possible. Good luck