Can you reproduce this 'stopping'?
Do you mean the lktsrv.exe (Time Synchronisation Service) is crashing or does it just stop as you would stop it manually or with the command line lktsrv -stop.
Anyhow. I could come up with two ideas.
1. You could periodically call a command line command which would start the time service e.g. lktsrv -start -quiet starts the service without a message box. If you type in lktsrv in a DOS command prompt it will show you all the command line parameter you can use for those services (lkcitdl.exe, lkads.exe, lktsrv.exe)
2. If you run on Windwos 2000 you could set up a recovery on all the NT-stylish services. Go to Start>Control Panel>Administrative Tools>Services, look for Lookout Time Synchronisation and open its properties and go
to the Recovery tab. There you could set up the service to be restarted after the first failure after maybe 1 minute.
This setup just restarts the service when the service failed to be started or crashed at some point. However, with this mechanisme it will not restart the service if you stop it regularly, manually.
I guess for National Instruments it would be interessting to have a reproducable use case where you see this time service stopping for some reason. I recommend to contact NI Support if you do so.
In addition I recommend to use the latest Logos/Citadel/Time Service from ftp://ftp.ni.com/support/lookout/logos and I recommend to use the latest firmware of FP-1600 from ftp://ftp.ni.com/support/fieldpoint/Update/
Hope this helps
Roland