Yes. For me, this is common. The problem is that the “keeper” latches in the front of the Drobo that lock the hard drives in place aren’t strong enough, or machined to close enough tolerances, to really keep the drive seated in the Drobo. When you move a Drobo, you’d be best advised to pop out and re-seat all the drives in the Drobo before powering it up. Press in firmly on each drive after re-seating it to make sure.
If you do get a “failed” hard drive, or a drive not present, don’t power down the Drobo. Just pop the offending drive out and re-seat it, then wait a few minutes for the Drobo to catch up with reality. It can take about thirty seconds for the Drobo to get wise to what just happened. Sometimes I’ve had to repeat this several times. Sometimes re-seating a drive causes another drive to be jarred loose, forcing me to re-seat that one too. Pain in the butt. Long relayout follows. Nothing to be done about it (except buy a RAID with better mounting hardware).
Of course there’s always the minute chance that you really did kill a drive by moving the unit. In which case none of the above will help. In which case, oops. That’s why you have a Drobo, right? Pass GO, collect WD warranty, replace drive. Get out of jail free.