The cable is up to me next to the power supply and an HDMI cable in the cable duct. Apparently it is not clean shielded because in certain HD channels (eg ARD, cable TV) massive disturbances, including eventual total "freeze" of the picture and sound. In SD or analog mode interference will not occur, so in view of the very reasonable price even 2 stars.
I have replaced the cable against a superior, now the HD channels to function smoothly.