now here is where i am a wee bit buggered. my evic, when i tighten the protank all the way so it doesn't wobble anymore somehow the carto causes a short as when i push the fire button it flashes at me indicating some error. i assume it's some kind of short. swopping batteries doesnt change it and most importantly, loosening the carto to the point where it wobbles does provide a stable connnection and gets it firing. right now the whole mess is "stabilised" with some prestik to keep me vaping. am i right in assuming its some issue with either the carto connector threading or the firing centre pin again. should also say have same problem with vivi nova tank