continually losing network license

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I'm running Vizard 3.0 on XP machines with 1 master and 1 client. The network license for the software is on a third machine, a server shared by the everyone at the research lab where I work.

At least once a day, the master or client machine (or both) pop up with an error that the network license has expired. Usually restarting that machine or the server fixes this but it's becoming a very time consuming problem.

Any suggestions for how to ensure that the license doesn't get lost so easily? Thanks.