I recently bought 2 ipv 4 mods. The problem im having is one of them works great, the other tells me "check atomizor" "check battery" and when it does work, the ohms jump from a .1 to a .3 on the ohm reader. I can only vape it on 40 watts, where as the other one with the same build im vaping at 100w. Im new to regulated boxes as opposed to mechanical boxes s. Any help would be appreciated.