SoapUI crashes

Hi,

I can't find out how to post a topic on the support or bug board, so I try here.

I have a problem with soapUI crashes.
I have a test case that runs WebDriver-code from a Groovy script. It starts a web page and that is about it.
After running it soapUI crashes (closes) suddenly. It happens randomly. Somtimes I can run the test five times without a crash, sometimes one. It usually takes some time after the run has finished until soapUI crashes. I get about one crash in ten minutes.
Why does this happen?

Best regards
Wanja