Question about WD MyBook Duo

We have a WD My Book 8TB from you. This hard disk is in constant use and does not switch to sleep mode (set after 10 minutes). Displays a temperature of 57 degrees C. The setting in WD Drive Utilities for the snooze function (10 minutes) is of no use. What can be done about it ? I didn't get a hint anywhere. The hard drive should be switched off when it goes into snooze mode... Kind regards, Heinz Schaub