When I disconnect connections on the enterprise versioned Geodatabase (from Geodatabase Administration settings), the collector app fails to synchronize changes with the database, and a sync error that says, “An error occurred while synchronizing edits” appears.
Hani, can you please check whether the feature service is still available after you "disconnect connections"? Likely it isn't , because it needs to be able to connect to the database in order to read or write to the feature class. And if it can't read/write to the geodatabase it can't sync any edits. Could that be causing the issue you are seeing?
After terminating the connection, I connect to it again, and the AGOL map can read the feature service again, but the downloaded map on the collector map (which is the same map in AGOL) still fails to sync with the database
