Game Freezes

I have occasional freezes, in which the game interface simply fails to respond (i.e., ESC doesn't work).  I have to ctrl-alt-del out and end task to recover.   There don't seem to be any error messages (I do have "collect game data" checked but don't know if that helps).   Is there a way to report this usefully?

I note that loading an autosave and replaying through the "freeze point" is successful.

Thanks.