How long do these typically last for? Ive had my current one for about a month and I guess its dying. The light is dim, but on, and turns off after a few seconds, and it stops heating the atty once the light goes off. I'm pretty much not getting any vapor. It works fine for the first couple puffs and then does this for about the same time as it would normally and then dies normally. Is it because the batteries are defective? or is it somthing I'm doing. I use the PCC and leave it on there overnight which i suppose isn't good. I vape it a lot too. So is there a way to fix it? or do i just need new batteries. I just need to know what caused this really so i dont do it again if i cant fix it