intermittent SDL Passolo license issue

Has anyone experienced intermittent failures from the pslcmd.exe with a return code of 98.  It seems if I start the Passolo User Interface it always works, but the pslcmd.exe fails just about every other time I run it.  This setup had been working flawlessly for well over a year and recently (within the last 2 weeks) started to fail intermittently.

My setup is the following:

- Passolo 2011, 1 network user

- A host server running SDL Licensing Server ToolKit 1.3

- A client running inside a VMWare instance on the host machine that acts as build server for our product

This issue causes our build server (which has the passolo client on it) to fail.