Mavericks Drobo Time Machine problem

On a new iMac with Mavericks, a new (December) Drobo 5D, I get "Time Machine couldn't . . " "Unable to complete backup. An error occurred while creating the backup folder." Disk Utility says everything is OK.  Drobo diagnostics (submitted to Drobo Support) apparently show no problems. "Not seeing any issues in the diagnostic file you submitted.  No disconnections and no drive issues.  Looks clean."
If I reboot, Time Machine works fine. Time Machine backup works fine. Everything seems fine.
Today is the fourth time in three weeks the problem has appeared.
Where does the responsibility for this lie? With Drobo or Apple? Neither side shows a problem. I am feeling frustrated.

Thank you, Norm G.
This "An error occurred while creating the backup folder" is not addressed by that support article. The problem has occurred with both Thunderbolt and USB-3 cables. Restarting currently seems to be the solution.
The Drobo replaces a LaCie 4TB drive that is full; this problem never occurred with that drive. The Drobo was formatted and set-up following Drobo instructions. Drobo has no suggestions since the diagnostics don't show a problem on their end.
So far, I can live with the restarting - since everything else functions normally.

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