Need to call twice to work?

[VPrime]

Hi I am having an issue with my magic Jack (2.06) on my computer (Mac mini, running 10.6.5)
The computer is on 24/7 and everything else is fine.. .Except magic jack

Magic Jack is fine for days or weeks. I can make calls, accept them etc.
Then after a while the phone stops ringing. The software still works and shows coming in, but the phone won't ring.

What also happens is I can't dial numbers. If I try to make a call I it doesn't work unless I hang up and then dial again. It always works on the second try.

Any one know what I can try? It is annoying having to restart the computer every few days or weeks, especially since it is my server!