It could be that your login / password info on the iCamSource or iCam has gotten into a bad state. If you try changing your login / password combination to something else does it still crash via 3G?
We did have one other user experiencing a similar issue and when they changed their login / password combination the issue was resolved.
If changing your login / password does not fix things for you, if you could go to
http://whatismyipaddress.com/ from the computer running the iCamSource and e-mail support@skjm.com what it says your external IP address is then we can attempt to look it up in the Broker Server logs and hopefully troubleshoot the problem. Please reference this forum post in your e-mail.