Thank you blurfl!! I will copy and archive the log files from the tests I run from now on. I also read this forum item and what I am seeing is at least partially like the experiences reporting in this topic
" Maslow Looses USB connection and all data of location etc"
I will not only check for the log file, but will make some basic changes about the usb cable quality, the AC service that the router is on,the arduino hdw, and the pc are on, and the separation of the router ac cable and the z axis motor cable(right now they hang together with less than 1/2" between them.)
I really appreciate your help, and will post working and non working logs so that it might help in the debug of these types of failures.