Invoice not saved

When entering a large invoice, with multiple item and a large story in the "notes to customer" section, I pressed the "Save" button, as normal, but was then prompted to enter "Two Factor Verification Code".  I thought this was unusual, but entered the code that was emailed to me, only to find the invoice had not been saved and I had lost the entire invoice and about an hours work. 

Is there a way to recover this entered information and if not is there a way to prevent this from happening again?

Note - Prior to this invoice, I had logged in as normal and entered Two Factor Verification Code and created multiple invoice without an issue.