All coils will need to be replaced after a certain amount of use. The time between coil replacements will vary according to the e-liquid used, output power setting and personal vaping habits. Actual vary from case to case.
This issue can be solved by trying these steps as below:
1. Make sure to prime your coil upon first use. 1 drop of e-liquid per cotton juice port is enough. Once primed, allow the coil to stand in a 3/4 full tank for at least 15 minutes before vaping.
2. Allow your coil to "break-in" before using it at the maximum recommended wattage level. Start your coils off at the low end of the recommended wattage range, and gradually increase to your desired wattage level slowly over the first day of using your new coil.
3. Please try opening up your airflow more. The more airflow that passes through the coil, the cooler the coil will be, and the less likely you will get a burnt taste.
4. Check the sweetener and VG levels of the e-liquid you are using. The thicker the e-liquid (higher VG percentage) and sweeter the e-liquid (higher sweetener content), the more likely it is to cause burnt flavour. We recommend using sweetener-free e-liquid for best coil longevity. If possible, try a different e-liquid to see if the e-liquid you are originally using is the cause of the burnt flavour.