After I now have a few years with a higher-quality cable had a reasonably stable connection, I have reactivated this old cable to my beamer with 1920 x 1080 and on my new LG monitor with 2560 x 1080 pixels and behold: Absolutely stable connection - top !
Mechanically makes the cable does not look like much, but so be it - as an inexpensive connection cables for the projector while traveling it is good anyway.