xserver failing on new install - fatal error on xcb connection

[Adam Rosi-Kessel]

I recently installed a fresh copy of cygwin64 on a new Windows 10 box. xserver starts but randomly fails after a few minutes with:

waiting for X server to shut down winClipboardProc - winClipboardFlushWindowsMessageQueue trapped WM_QUIT message, exiting main loop. 
winMultiWindowXMsgProc - Fatal error 1 on xcb connection
winDeinitMultiWindowWM - Noting shutdown in progress (II) Server
terminated successfully (0). Closing log file.

Any pointers for how to troubleshoot?