WinSCP.exeto transmit files. It has worked fine for all these years until recently. This service runs 24/7 and wakes up every minute to poll an FTP location for files. All of a sudden, at least once a day, sometimes more, it throws the error "Cannot use WinSCP.exe" (the error message contains the correct full path to the .exe). It will continue to throw the error until I restart the service. Then the problem is gone (for some indiscriminate amount of time).
Updating to the most recent version hasn't helped.
My first thought is that the .exe is getting quarantined as malicious but we can find no evidence of that. Plus, that doesn't make sense, since restarting the service fixes the issue.