Is anyone noticing the occ coils being really hit and miss or is it just me? I'm some of the coils which are authentic are lasting me weeks on end and then some a day or two.I tend to vape in spurts take 3 or 4 pulls set it down for a while. Once and a while the third or firth pull I get a burnt taste and then the puffs taste horrible following this happening. I'm currently using an ipv mini 2 at 22 watts so nothing super over powering. Is it just a case of user error or another case of kanger's fantastic quality control? Thanks for your help