Sorry to hear that, but also somewhat comforted to know that I'm not alone...
I too have gotten into the habit of hitting Ctrl + S every few seconds! :-)
Here are a couple of threads from the Sony forums that deal with the crashing and P2 MXF files. Unfortunately, nobody has found a fix yet, but I'm going to be watching in hope of finding good news:
http://www.sonycreativesoftware.com/forums/ShowMessage.asp?MessageID=832868...
http://www.sonycreativesoftware.com/forums/ShowMessage.asp?MessageID=834075...
I'll try to report back if I hear anything. Appreciate your quick reply!
- Luke