Even if it happens once in 20 times, it's still useless!
Here, I don't agree. Because, obviously, before saying something that happens so rarely, it's a GSX "problem", it would be best getting to the bottom of this because, obviously, GSX Pushback runs always the same, exact, code, there's nothing "random" in it.
What it's likely changing, is you are trying different airports so, if with "crash", you mean the airplane crashed into something, it might be caused by something specific to the airport. For example a too high altitude difference or a terrain "bump" in the scenery.
Have you noticed if it happens more often on very long pushback routes ?