I have been using boge carts for awhile generally 3ohm at around 4.6v. I just received 35 (6boxes) and four of the first five failed in the first hour. I just wanted to ask as i'm new here and not altogether experienced with these things (v2 for a year and mods for a month). Is this common? does anyone make "the most reliable large cartomizer". I have a fast paced job and I usually fill up 3 cartos (though I dont use all three usually) for work. I'm willing to pay a premium for something rock solid and reliable. I thought maybe those were the boge but maybe i'm wrong. Are the smoktek the most reliable? The problem i had wasnt doa it was after about a 30min to 2hours on the 4 of the first five the ohms went from 3ohm (2.9 to 3.0) to first 2.3 then 1.9 then 2.1 then 2.3..... is this something that just happens and is not indicative of the brand?? any suggestions would be appreciated thanks!