Just bought one myself and had that problem after the second week. I think your
tank is threaded on too tight. I read in a forum somewhere here that there is some type of pin that is getting pushed up too far.
I would put in the battery and see that there was power and then it wouldn't turn on. Also had a problem with the first couple 18650 batteries I bought. Got them on Amazon - Trustfire's - which some people recommend. Think it was the batteries. I am using EFest and they are holding up great. Almost all day and I vape a lot.
Check the connections in your
tank. Clean out the area where you screw down the tank and don't tighten it too much. Just til it makes contact. Hope that helps
