It sounds like SyncTrayzor is either no longer starting up when you log onto Windows, or there’s an issue with SyncTrayzor starting Syncthing. Check SyncTrayzor’s settings.
If the problem persists, note that the SyncTrayzor project has been idle for more than 2 years, so it might be well worth switching to another wrapper/tray app that’s still actively supported – e.g., https://forum.syncthing.net/t/yet-another-syncthing-tray/8502