Hi All,
Just to follow up on my post in case anyone else has a similar problem.
A few hours after I wrote my original post I did the following and Office 2013 is now stable and no longer crashes after now several weeks of use.
1. First open any Office 2013 program. For example open Word 2013. It'll open in new Start Screen mode. Click on "Blank document" option.
2. Now click on "File" menu present in the ribbon and then click on "Options" link given at the end of the left-sidebar.
3. It'll open Options window. Click on "Advanced" tab and scroll down a little. Look for following 2 options in "Display" section:
- Disable hardware graphics acceleration
4. Enable "Disable hardware graphics acceleration" option and click on OK button. Restart the program.
Probably not problem solved but definitely problem worked around.
Thanks