Imported information disappeared or was deleted by Turbotax

I imported last year's taxes, my w-2, investments, etc and the first few times I saved it, it worked. But today when I pressed "save" it said "Could not be saved. Try re-starting..". After I re-started, turbo tax, it started the program as if I was a new user and all my previously saved data had disappeared!

I want to prevent this from happening again in the future. Was I supposed to press "save as" instead of the "save" button?