Your Sync App Desktop service is continuously stopping, preventing invoices from publishing successfully, and nominal codes from syncing.
Sage 50 users
QuickBooks Desktop users
The AutoEntry Sync App is designed to restart itself in case of any disruption in the background without any interaction by the user. However, there is a Windows default setting that can prevent the Sync App from restarting for 30 days, causing the sync to remain stopped until you manually restart it.
Here's the quick fix to prevent Windows blocking the Sync App from restarting:
Open your PC's Task Manager.
Select the Services tab and click on Open Services or Services - depending on your version of Windows.
Right click on AutoEntry.DesktopSync.Service (note, there are two AutoEntry services listed) and select Properties.
In the Properties window that opens, select the Recovery tab.
Change the Reset fail count after field to 0 (zero).
Check the box to Enable Actions for stops with errors.
Click Apply and OK.
If you are still logged in to the Sync App, log out and back in again. Any invoices that are ticked as published but not in Sage 50 or QuickBooks will need to be unpublished and republished. It can take 5 - 10 minutes for publishing to complete.