Disabling hard drive auto-sleep

Im on a IMAC with the following external hard drives attached to my USBC ports.

G-Grive with Thunderbolt.

I have unchecked “Put hard drives to sleep when possible”, but they keep going off every fifteen minutes or so. Makes my computer lag for about five seconds whenever I try to access them after this point which I’m an editor so this is not acceptable.

The drives shouldn’t be going to sleep by design.

You can try resetting the SMC and NVRAM on your Mac to see if that solves the issue.