First, when the data line is inserted and removed, you should press on the head instead of pulling it out directly. This is a habit of many people, because they don't take the data line seiously. So when the plug is inserted, people pull out the lines directly, resulting in internal breakage and reducing its working life. At the same time, folding or bending the data line near the plug will also reduce its service life.

Second, you can't put the data lines in a dusty or humid place. This tends to cause the data lines to be oxidized, resulting in poor contact.

Third, improper connections can damage the data lines. It is understood that 40% of people will coverthe breakage when there is a problem with the data cable, instead of checking it, which probably leads to a short circuit or an open circuit, and naturally it will not work properly.

What is the cause of the hardening of the USB data cable? Is it the cold weather? In fact this is also one of the reasons. Acually from the professional point of view, the standard answer is the oxidation of plastic materials caused by oxidation, grease corrosion, etc., so it becomes so hard.

The outer protective layer of the USB data cable is mostly madeof rubber. The rubber product itself will change due to the temperature, but this kind of change won't last long. Generally it will become normal as the temperature turns normal. As for a thin layer of rubber on the USB data cable, if it is oxidized and corroded, it will harden for different degrees. The good USB data cable is also the same. They become hard  and easy to break.

Then the USB data cable can be protected from hardening. Please follow below points:

2. Do not wrap it with your hands. The sweat will corrode the line, causing the line to become hard until it breaks.

3. Do not touch acid or alkali liquids, especially sweat, including beverages;
4. Do not make it go through severe temperature differences, for example when you come out of the air-conditioned room in winter...
5. Do not wrap the USB cable around the machine too tightly;
6. USB data cable can be hung on mobile phones and computers. But please remove it when not in use;
7. When not in use, it should be placed in a place where it is protected from direct sunlight. It is best to put them under dry and ventilate place. If permitted, reserve the data lines in vacuum.