and saving constantly,
Just some suggestions:
Use numbered backup methode manually (MyFile001, Myfile 002...) and save often the stages with increased number in filename for more security.
Never open/edit/save a file from a pendrive directly. Copy it to Hard drive before you open it.
Tibor Kovacs, Hungary; AOO4.1.2; LibreOffice4.4.7 and Portable LibreOffice5.1.1 version on Win7x64Prof
Please, edit the topic's initial post, and add the word "[Solved]" at the beginning of the subject line - if your problem has been solved.