Yes, this is the second time for an issue like this. First was a ControlLogix V32. I was not able to read several registers from an outside network and the HMI stopped reading from the PLC. A download "fixed" that. Rockwell recommended a firmware update, which I did. Have not seen that one again.
Second is the one posted here, which I have already described.
This recent one with the 5380 is version 32.12.
I updated the ControlLogix L83ES to version 32.16.
Yes, at least some of the data was in a UDT.
I am in a production environment. Luckily, it has only been informational data affected, machine performance, HMI display. So didn't stop anything from running. Other than the time to troubleshoot and fix...