Database Error After Website Migration Is It Normal?

I recently moved with duplicator pro. All is doing well until I tried bulk editing the category on about 100 posts and the establish database error to wordpress error comes out. I restarted my server now it's all fine and dandy. My question is this, is it normal to have it? I'm still having my old server up just in case I screw up anything.

Duplicator Pro is good for transferring small websites. when you moving a large amount of files, it sometimes doesn’t complete the process. and you need to ensure that your hosting service has enough CPU and RAM to handle the migration. For large websites best to migrate manually .

Of course, database errors happen quite often after a website is moved. They are generally caused by bad database settings, missing files or incompatible versions. So make sure you set correct database settings, permission, and all files are transfer.