Questions about red5 and red5phone

I am using red5-0.8.RC3-build-hudson-red5_jdk6_stable-130 and red5phone. I complie and run the red5 server on netBeans.When I start the red5 server, the red5phone work and can make a call sometimes. (Sometimes the call cannot reach the destination) However, after several calls, the red5 will crash and have no response to all applications which have installed in the red5.

What wrong with me? Why the red5phone will make the red5 server crash?

I hope that anyone can help me!

Thanks

Vincent