Could the existing comments here at the time of installation fully confirmed by almost exactly ten months, the cable has eased but for no apparent reason, which made itself felt in a single drive failure.
Trying to block it again firmly, revealed a shaky clip and a little stuck socket as obvious cause, which occurred at both (!) Ends of the Kable.
The wear rate is incomprehensible to me since the time of installation, everything seemed to be tight.