Running Enterprise 10.9.1, with a SQL Server DB
Publishing as a web layer from Pro,
Feature class is a low polygon count with a simple definition query
The web layer has 16 FCs, it's always the first one in the TOC (which never changes) and the only one that vanishes.
Happens intermittently every few months, we just open the Pro project, hit "overwrite service" and it's back.
This is the only service exhibiting this behavior
Not a huge issues, but does generate a helpdesk ticket and annoyed staff.
Other than ghosts or Gremlins, any ideas?