Read it, but I'm at a lost... perhaps contact support on the home page? I've never seen a thread about this issue either. Perhaps something on your PC is running in the background that is closing it down? Dunno, the ONLY thing I can think of is starting the PC in safemode and seeing if it crashes then? I'm grasping at straws with that, but to me the only thing I can think of is that something is running on your PC that is actively shutting it down.
It may also be an Internet Explorer issue (it runs off of IE).