Just recieved my ext. tube for my roughstack. I am using 2x 18350 batteries but it only vapes if i keep pushing the switch repeatedly like my kids playing mario bros.? Tried changing out the spring from the standard battery tube and same thing. Works fine with 1 18350 battery i have been vaping for months. I tried different atty's and carto's from 2.8ohm to 3.7ohm(that is what me tester reads) on ext. tube with same results. I have tried an old switch(yes i know im a hoarder) and it still dont work. I dont know what the deal is any input?