OS5, EX4111 and power management

Hello everyone,
since I have updated to OS5 my EX4100 does not stay in so called Drive Sleep. I can hear the discs stop working, but they immediately start again and do not stay in Drive Sleep. Is that a bug or a feature?
With OS3 I sometimes didn’t use the NAS for hours and it stayed in that mode. As soon as I needed files, the NAS woke up again. Very weird. I really wonder, why I updated to OS5, everything worked fine with OS3.
Thank for helping me here.

FYI:

Device wakes up from sleep every hour : We have been able to reproduce the issue and are investigating the issue. We will provide a fix in a future release.

https://community.wd.com/t/update-on-my-cloud-os-5-feedback/258099/2

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