Intel Raid 5 help, drives sleep but constantly make spin up noises.

Greetings, I have an Asus Prime z270 motherboard with oprom. Using the drivers and UI my raid 5 array of 4, 2TB disks appears to sleep after the allotted time set in Power Options but once in sleep the drives continuously sound like they are trying to spin up, once every 3 seconds or so. I’ve tried enabling Aggressive LPM in the bios, disabling intel services and the driver, nothing helps. Drives not part of the array sleep without making any noise.