I would like to know what you type into the browser
exactly and what file it correlates with.
For example, I came across the issue when typing
www.example.com/, but it eventually leads to
www.example.com/index.html
Regarding the stops working issue, did you experience a high CPU usage or memory usage during this time?
Based on your description, it sounds like there was no crash, so there probably isn't a core file.