Thanks Bruce, but I found it.
I disabled the WDT too, and now all is working fine. With your response, I think... What
Bruce expect to find in the hex file..?.... Maybe unwanted WDT timeouts. So I added
the define for the WDT_OFF and all is OK now.
Thanks again...

!!!!!!!!!! Bad news !!!!!!.... I test several times while making the reply and the button is erratic.
The button funcion is to stop the current operation and return to the options menu.Now when I
operate the button, the operation stops and after a long timeout, returns to the same option or
some times stays and do not return to the menu. I need to reset the system to reach the menu
again... Back to the drawing desk...
Greetings !
Ruben de la Pena V