I'll explain this one real quick, as it affects you while you are creating.
Basically, if you stretch a missile enough it seems, it can CRASH the game. I don't know too much on the specifics, but it's after a certain point, when you launches a missile, it instead crashes the game. This is also a problem since it does the same thing server latency issues did, where it clears save data.
If you can, bump this up to the creators so they can fix it. Thanks!