Sorry for the delay but there IS something to be said for a vacation with no connectivity. :-)
I did some more checking and discovered something. When the system hangs, I get no /var/log/dmesg file for that time. The system must crash before the log file is written.
Yep, that looks like a pretty good candidate. Plymouth .... what a surprise.
Just curious what I should do about this. I was thinking about loading debian to see if I have similar problems. Do you know if debian uses plymouth.
PS I tried to change to title to delete the reference to grub but I am not sure I was successful. ;-(