Hog 4 Fan Noise in 3.9(1704)

Since installing the release of 3.9(1704) on BOTH of my Hog 4 desks, there is a fan that continues to kick on and off throughout the day. It sounds very much like the fan that kicks on during shutdown. It is a bit on the loud side. Diagnostics show everything running fine. No overheating of any kind. Was something changed with fan control for 3.9?