Drobo 3 continuously recycles thru startup routine. Disk lights never turn green (remain amber) and, of course, Drobo Dashboard never finds the Drobo. Everything was working until I erased the Drobo and accidentally pulled the USB cord before the process had completed. I have pulled each disk out individually, erased and reformatted them and returned them to the Drobo. Still continuously recycles the startup routine.
Try a different power supply, it’s the usual suspect in boot loops, the extra power draw during that reset may have pushed aging components over the edge.