Problems with your device could be too thin of a liquid, defective coil, o-ring out of placement or just terrible tolerances in the machining of the device.
Try changing all the seals and o-rings. Especially the top fill seal pad. I have had good luck with my Smok tanks. Occasionally one will leak even right out of the box and it has always been the top fill seal pad causing the problem.
BUMP.
Inclined to agree with the above speculation.
Have you changed out the o-rings?
Are you making sure your o-rings are fitting properly? Any of them broken?
Do you close your air flow control to fill the tank? Do you open your air flow control before using the tank?
Does the coil have enough wick? Too much wick?
All we are capable of here is asking you the device user questions, then possibly provide you with a little guidance or advice. Eventually, I will get around to making the transporter you see in Star Trek. Then, you can transport a device into a veteran vaper's hands, they can fix the issue, transport it back. Until then, here is what we got.
If we direct you to do something we normally have good reason to do that. It's nice too if you let us know what you're doing to help yourself solve the problem/s. I see you say you changed the coil but are still getting leaks. So, I had to ask if you've changed out o-rings. I had to ask about your air flow control. I had to ask your wick. You didn't say anything about these.
Not trying to sound mean to you. The problems you're having frustrate us as well. We want you to enjoy vaping. If though you're not helping yourself a bit, it makes it difficult for us to help you. We obviously cannot be there with you and fix the device, or use that transporter I need to build. So, you have to help yourself by trying what we suggest, keeping us informed of that. I think you can do it too.