This is simple enough, and I'm sure I'm not the only one this happens to, but this has been happening for years, every time I get started I do about an hour of work then its complains it has stopped working and closes! No save option, no autosave, no back up, nothing!
A very simple way to fix this, have an autosave!
Please accept my sincere apology for the inconvenience. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
This is happening to me today over and over again... I have autosave, when i reopen illustrator it suggests me the "recover" file and yet i get my last manual saves and nothing more :(( what to do ?