Octave Crashes or Sudden Exits

[Thomas D. Dean]

I am getting some octave crashes or sudden exits. 2 or 3 times per day.

Octave 6.0.0 built from sources.
octave:2> [V,D]=version()
V = 6.0.0
D = 2019-02-23

> ls -l `which octave`
lrwxrwxrwx 1 root root 12 Aug  9 15:06 /usr/local/bin/octave -> octave-6.0.0

Ubuntu 18.04, 5.0.0-23-generic kernel.

I am running octave in an xterm with:
/usr/bin/xterm -T Octave -en UTF-8 -j -sk -sb -sl 1000 -fn 9x15 -bc \
      -bg white -fg black -geometry 80x55 -e octave --no-gui &

Octave just exits.  I hesitate to call it a crash because there is 
nothing in dmesg and nothing in syslog, etc.

I do not think any specific action consistently causes the exit.

Any ideas on how to possible track this?

Tom Dean