Thanks for the excellent support !!!
I installed the latest firmware (1.2.2) and re-tested. It certainly looks like the hang condition has been fixed. In all my tests with this version, so far the WiFi Rev2 has fully recovered each time.
still much more testing needed but I am now past the one which was killing me, I'll post again when I am complete with my testing and/or I uncover anything else.
Again, I really appreciate the rapid assistance and advice.
Thanks !!