After about half a year of normal use but has now solved at both connectors, the insulation of the cable from the kink protection, the entire burden will now be probably not last long on the wires.
For comparison, the HTC charger cable is in use for years in the car where it dragged around and trampled on it, so far without damage.
Now have a data cable from BlueRigger bought, it makes a much more solid impression and is also flexible although it is even shielded.
