Very unhelpful error message. Should I worry?

[james.levieux]

The sync seems to be successful because I can see my work on other computers, but....

[Alfredo_Medina]

That usually appears when the internet connection is interrupted at your location, or when there is a service outage in BIM 360. However, it seems that you were able to synchronize before that happened. If the next synchronization goes well without an error message, you can ignore this one. 

[james.levieux]

I finally resolved the issue by relinquishing all in the cloud model and auditing.  Not sure which step fixed the issue but I'm guessing relinquishing all.  Overdue standard housekeeping I suppose!