Bug#263891: XFree86, X server crashed

[Bruce Wong]

Package:  XFree86
Version:  4.1.0.1 / X Window System (protocol Version 11, revision 0, 
vendor release 6510)

I am running Woody 3.0 r1.  on a Dell Dimension XPS Pro 200n.
The desktop runs fine, but after some idled time
I am getting the following error from the XFree86:
  Fatal server error:
  Caught signal 4.  Server aborting.

What could have caused this?  I presume it's some configuration error.  
Any suggestions would be appreciated.

Thanks

Bruce