Yes sounded like the database was slightly corrupted in some way and didn’t run the usual automatic database repair tool.
If you have this issue again, you can also manually run the database checker rather than change the location of the database. See @Gary post from the below thread.
https://forum.emclient.com/t/can-i-use-the-v7-manual-database-repair/70640
Gary
Feb 10
The database repair is now built into the MailClient.exe file. If it detects an issue with the database, it will repair it automatically. But if you think you need to repair the database, you can run this command with eM Client closed: “C:\Program Files (x86)\eM Client\MailClient.exe” /dbrepair