Hi Provarifan. I have two of the agr
tanks, neither of them have been giving me an issue. They have been in heavy rotation for a few months. Does it leak from around the cartomizer or Through the cartomizer itself? If its from the perimeter of the cartomizer, I would contact your vendor and have them replace it. If its through the actual cartomizer then your holes are too big for that tank. That's all I have for you on that, either way something sounds off.
The other thing I can think of is this. Your draw, are you a light draw, or a heavy draw? If you have a heavy draw(lots of suction) then you may have your holes too large for your draw type, if you have a light draw(little suction) then it sounds like its just an improperly assembled tank..... Good Luck.