4.2.1 drive spindown on 5N

I’ve been running 4.2.1 on my 5N for a week now, and it sure seems like the drives don’t spin down. I have 4x4TB WD Reds in it. I went back to 4.1.4 just to check, and all was fine. Anyone else seeing this, or am I having a unique experience? I like the event log viewing in 4.2.1.