Please indicate a precise reproduction case of GSX not working. The airport used, the gate used, the airplane used.
If you mean the "Restart Couatl" option sometimes is not working, we are aware of it, and in fact, the manual explain that option should be used only as a backup, if something goes wrong. So, we need to work on the "something goes wrong" part: why GSX stopped working, that's why you should make a precise report, otherwise it's not possible for us to investigate on it.