I dont think upgrading to SP3 will fix your issue. It sounds to me like you lose the wifi signal and that is why you get Done wiht nothing loaded. From the sound of it.
My best suggestion. Make a backup of your profile and all your extensions. After that uninstall Firefox and get rid of the App Data folders. Then reinstall Firefox and see if it happens again.
This way we can rule out if it is a extension you have loaded or if it is Firefox itself.