A. Please replace a new pod or a new coil, and it is not recommended to continue to use it. B. There are usually four problems that could cause a burnt tastE. 1. The pod/coil reaches its maximum lifespan. 2. Abnormal use and dry burning are prone to burning, for example, if the liquid has been exhausted and continues to use the device, it will be prone to burning. 3. Using thicker e-liquid (higher vg) can also cause coil burning, and you can replace the e-liquid with a thinner one. 4. Please prime the coil before using the device and then wait for about 5 minutes, or it will be prone to burn.