Hey everyone first of all I'd like to say I've been browsing these forums since I started vaping and already it's been a big help. Anyways right now I have an mvp 2.0 & I've been using an aspire k1 tank. First I am curious as to why every other day or so the coil comes loose ? Next I'm interested in possibly upgrading would you recommend upgrading the tank to maybe a nautilus, or kangertech before I dropped a bunch of money on a mod? Thanks in advance!