Server: SELECTserver has not been contacted for 30 days. ProjectWise Integration Server is now running with a 4 hour evaluation license

Our projectWise Integration Server service is stopping.  I am seeing the following message in the even log.

"Server: SELECTserver has not been contacted for 30 days. ProjectWise Integration Server is now running with a 4 hour evaluation license"

We are currently running in eval mode.

What is causing this?

Thanks