I've managed to solve the problem of the freezing and de corrupt data (sort of).
I figured that the main problem is the ammount of saves that you create. If you keep just one save and none quicksaving the freezing almost never occour.
You can also use 2 usp drive as "memory cards" and salve you progrees.
I know that isn't a definitive solution and that flying tiger need to send a patch to correct that problem but if you already bought the game and is in the urge to play this may help.
now I have 6 flyghts in progress in the sandbox.
