Where are you saving and opening the InDesign files from? I mean is it local or on a Server/network drive? If it is local, would suggest you to check for background processes, particularly sync and backup.
Think i found the problem.
After following the diagnostic reports in the console, i noticed that Indesign triggers the automount system and tries to mount the shares in /etc/fstab. Since there was a deprecated share in the fstab-file, Indesign keeps trying to mount it which will never succeed.
Remove the deprecated share from fstab
Run "sudo automount -c" to flush any chached information.
I'm glad you got it sorted. I think you're the only person who could have figured that out.