2018 imported 2017 and now all 2017 tax returns are gone

In addition to this year's software constantly crashing I just saw that when I imported last year's tax returns into 2018 all tax info from 2017 is now missing from my computer!  2017 intuit software shows none of my 5 returns in it and the tax folders from my laptop are missing 2017 entirely.  Anyone else have this happen?