This typically happens when the device is overtightened. Try unscrewing the cartridge just a little bit and see if that improve airflow. If this does not improve the use of your device, contact support@kandypens.com

There is a chance the battery has been damaged by overtightening of cartridge or atomizer, or possibly a faulty charger. Try to clean the connection area on your battery, attempt to charge with a different charger, or attempt to charge a different battery with the same charger. If you are seeing no results, please contact support@kandypens.com

There may be a cartridge compatibility issue with your Slim. If possible, please check your device with another cartridge or contact support@kandypens.com

Check to ensure your Slim is properly charged, as a fully depleted Slim battery may not light up when you attempt to use it. Also, check the tightness of your cartridge, and attempt to loosen your cartridge to see if airflow was possibly blocked.

This is purely a cosmetic piece of your device and will not affect usage. You may also contact us at support@kandypens.com