Occasionally my X server will spontaneously exit.  This usually
happens when the computer is left unattended.  I've attached the Xwin
log file as well as my Cygwin configuration.

[168698.576] winClipboardProc - winClipboardFlushWindowsMessageQueue
trapped WM_QUIT message, exiting main loop.
[168698.576] winClipboardProc - XDestroyWindow succeeded.
[168698.576] winClipboardIOErrorHandler!
[168698.576] winMultiWindowXMsgProcIOErrorHandler!
[168698.576] winInitMultiWindowXMsgProc - Caught IO Error.  Exiting.
[168698.623] (pid 311244 stderr) xterm: fatal IO error 11 (Resource
temporarily unavailable) or KillClient on X server ":2.0"
[168698.669] winDeinitMultiWindowWM - Noting shutdown in progress
[168698.669] (II) Server terminated successfully (0). Closing log file.

Here's how I start the server:

    C:\Cygwin\bin\run.exe --quote /usr/bin/bash.exe -l -c "cd;
/usr/bin/startxwin"

Cygwin version:

    CYGWIN_NT-6.1-WOW JJR 1.7.35(0.287/5/3) 2015-03-04 12:07 i686 Cygwin

--
Jim Reisert AD1C, <jjreisert@alum.mit.edu>, http://www.ad1c.us