You may see the following error in your Event Log, specially when running a Windows Service.
The [Service_Name] service terminated unexpectedly. It has done this 1 time(s).
Problem: There could be multiple reasons for the above. But if you find that your Service executable file (.exe) has been automatically deleted then guess no further, you must be running an AntiVirus Program, which may have recently updated its definition and finding your safe service program as a threat, so it is deleting when program is trying to run.
Solution: Go to AntiVirus console and find an option to exclude the program folder or path from being checked.
You may need an administrative privilege to perform this operation.