Have not had any real issues with my DROBO FS but lately things changed.
DROBO Dashboard sees the unit BUT my finder does not so therefore I cannot do anything with the files on it - obviously I guees.
I have updated DROBO software, restarted IMAC, and BTW even went through a complete reboot of my computer do to a failed HD.
macOS High Sierra - v 10.13.8
iMAC (27" - mid 2011)
3.4 Ghz Intel Core i7
16 Gb memory