I bought my aspire pockeX a little over one month and never had any issues with it or changing my coil, however over the past few days I’ve noticed my liquid tastes burned. I’ve only used liquids recommended by my vape shop and have put in 3 new coils since then and primed them all correctly. My vape shop recommended I move up from 12 mg to 18 mg nicotine liquids. But since then my vape has began popping quite loud before firing which has made me nervous to use it. It also gets quite hot when charging which I find worrying. Do I cut my losses and buy a new one if my vape shop won’t replace this?