When one or more documents are open and Writer is not used the writer usually crashes after a while.
It doesn't matter if the Window is open or minimized, if the PC is used or just ignored.
Problem did not occur bevore I updated LibreOffice
Steps to reproduce:
1. open a document
2. don't use LibreOffice and hope it happens
Platform (if different from the browser):
Win 7, 64 bit
Browser: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.1
Does this happens with specific document or all documents? Could you try to reproduce using clean LO profile - http://wiki.documentfoundation.org/UserProfile
Could you try what bfo indicated in comment1 + with a newer LO version (3.5.6 or 3.6.2)?
No Feedback since months, so put it INVALID
dings2010: if you reproduce the crash with last LO version (3.6.4), don't hesitate to reopen this tracker.