Description:
Node manager service may stop automatically when running with custom Windows account. By default, it runs as the "Local System" account. Some users may want to use a custom account to run the service, which may not work and result in the below warning.

Symptoms:
If the logon account for Node Manager service is changed from the default account to a custom Windows account, starting the service throws the following.
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Services
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The TIBCO Spotfire Node Manager 7.5 service on Local Computer started and then stopped. Some services stop automatically if they are not in use by other services or programs.
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OK 
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Cause:
This occurs if the account running the Node Manager service does not have desired permissions on the Node Manager installation folder.

Add the desired Windows account to "<Installation folder>\tibco\tsnm" and grant "Full control" permissions to it. After saving the changes, you should be able to start the service without any error/warnings.

Refer to the attached screen shot for reference.

Node manager service may stop automatically when running with custom Windows account

https://docs.tibco.com/pub/spotfire_server/7.6.0/doc/html/TIB_sfire_server_tsas_admin_help/GUID-3237F847-3135-4F10-8284-1D66F6DEC36E.html
Home > Installation and configuration > Node manager installation

Refer the attached screen shot (Filename: Node_manager_folder_permissoins.pdf) for more information.