crashing and deleting progress

I know if you're using an iPad,  you can share crash reports with the developers.  But as Sjaani asked, what device are you using?  Also what storage capacity do you have.  I know with iPads if you're running low on memory, things can act a bit squirrely 

Try to look in version history when was the last saves and look into "technical help diary" that is located in preferences/help. You can download a text file. That can be problem with fresco logging into your account after crash. I same cases (for instance after upgrade of fresco) you not logged to your cc account and program restictes syncronization, i.e. it overwriting you current state of work with last saved file from before crush. Check the time on versions history. In such a case in tech diary you will find line like: "sync restricted". 

Sounds very strange.

What type of device are you using?

Check if there is an update and see if that helps to solve the crashing/deleting progress issues to start with.