Nothing changed on my end. Most of the drives go to sleep. I started to notice a recurrence of the problem some versions ago. I realize my set up with over 2 dozen drives is not an easy situation to test with. But you recognized initially there was a problem when I first posted this thread and that it bothered you too. And you did do something that resolved it. But it's now back.
Are there any relevant settings or tweaks I should consider looking at?