If your 220V strip is experiencing intermittent lighting, where some sections are illuminated while others are not, it may be due to one or more of the following reasons:

  1. Physical Damage: Mechanical damage during installation, such as excessive pulling or stretching, can damage the internal wiring and lead to burnout,result in sections not lighting up. Handle the LED strip carefully during installation to avoid physical damage.
  2. Short Circuit:  After cutting and install the strip, the pin is improper to the position, then the poor connections between the segments of the LED strip can cause parts of it to not light up. Check all connections to ensure they are secure and properly attached.
  3. Soldering Defects: Occasionally, defects from the manufacturing process can result in some sections of the LED strip not functioning properly.
  4. Overheating: Excessive operating temperatures can affect the performance of the LED strip, causing certain sections to fail. Ensure that the installation environment is well-ventilated and not excessively hot.
  5. Power Supply Problems: An unstable or insufficient power supply can lead to uneven power distribution, causing parts of the strip to flicker or not light up. Verify that the power supply meets the requirements of your LED strip