Meetings created after some time start shoing up "re-created a meeting that was missing from your calendar" with no body information e.g. Lync meeting

My manager is having a problem.  "randomly" reoccurring meetings in outlook will after some time start showing as this:

"Exchange 2013 re-created a meeting that was missing from your calendar"

With all the "meat" of the body is missing.

We are running Exchange 2013 SP1 and Outlook 2013.  They look the same in OWA.  Meetings can be from different senders, different times etc.

Any thoughts?