@bravenel, I too can confirm these errors are happening on my system with far more frequency that I would like. Something is definitely fishy. Problem is cannot say when it started...; the hub logs went from non-existent before to being there, lots (very scientific, I know!)
Note: I have no ability to create these errors on demand.
The most recent entry in the log is for Motion Zone Controller.
2020-01-14 08:46:13.546 pm errororg.quartz.ObjectAlreadyExistsException: Unable to store Job : 'app3991Once.zoneOff', because one already exists with this identification. on line 223 (inactiveHandler)
I will add / update with different devices when the error occurs. (and they will)
EDIT: These errors appear to be far more frequent when the hub is "stressed", like an arrival event, or when somebody trips the alarms. But again, not consistent.