You can avoid many of these issues by taking good care of your device. Here's what I tell my friends:

• Store it upright – This prevents e-liquid from pooling in the mouthpiece.
• Keep it clean – Regularly wipe the mouthpiece and air vents to prevent buildup.
• Avoid extreme temperatures – Don't leave your vape in a hot car or in direct sunlight.
• Don't overcharge – If your device is rechargeable, unplug it once it's fully charged.
• Use it regularly – If you let it sit for weeks, the coil might dry out or the battery might drain.