So this is weird... Just got some shocks to the fillings in my teeth while vaping on my Kanger Aerotank Mini / Ego-C Twist Battery at 4.8 volts.. Before it happened, I started to get a metallic taste in my mouth, kind of like when you bite down on a foil gum wrapper. The shocks were similar, too. It happened a couple more times, so I turned my battery down to my usual 4.2 volts, which made it mostly go away; but I'm still getting that awful tart/metallic taste. Has this happened to anyone else?