CAMWorks losing its network license intermittently

PC connected to mill gets its CAMWorks license from Windows Server using FlexLM. Network is wireless. Operator reports that CAMWorks stops working.
License status window shows all the licenses greyed out and gone. Clicking the Refresh button in the license status dialog doesn't do anything. Restarting Solidworks restores normal operation. Anyone else experience this? We're gonna try to snake a hard wire from the nearest network jack to the PC to see if it's related to the wireless (possibly a dropout). All other networked applications (email, web, file sharing) continue to work fine.
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