Since upgrading my iMac to High Sierra Beta I somtimes got the 'Disk not ejected properly' from my Thunderbolt 2 raid (still HFS filesystem).After now connecting my USB 2 external disk to back up after about a minute or two it started to constantly connect and disconnect (Hole list of "Disk not ejected properly" in notifications).Connecting both disk to my Sierra MacBook Pro does not show this behavior. Any idea what is triggering this?