Problem with DSLS Server

-Currently, DSLS server is installed in A area, and the same license is used in another area called B.
-Problem occurs when you are working Catia in Area B and do not work for about 30 minutes
-Environment: ServerPC: Windows Server 2012 R2 Standard, DSLS R2019x 6.421.0
ClientPC: Windows10 Pro CATIA V5 R2015
If you have any experience like this or know the problem, please help.
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