The system log is reporting this error every 5 -6 minutes. I never had this problem until I upgraded the firmware to 1.04 to try and solve another problem related to a Volume1 is in degraded mode message on a RAID5 Configuration. I am now running a simple 4 X 2TB drive configuration and I am getting this message. The temperature readings on these drives vary between 38 and 48 degrees C.
In other reports of similar problems, advice has been given to manually turn these drives on using the admin portal I cannot find this toggle anywhere.