Exchange 16 User running in-place EDiscovery search with errors on some msgs

[m0bov]

Hi all, our Data Protection Office is trying to run a search, but when she clicks on Preview results some of the messages have a down arrow. When you click on the message it says unavailable, try again later.

 

I have previewed searches made last year (which were ok) and these are also showing random message with arrows.

 

We are running Exchange 16 CU12. I'm not very familiar with Exchange 2016, but is this a known or common problem? Googling has not shown anything of much use.

 

Thanks,

James