My Kanger Geni is loaded with a 1.8 ohm coil. So far my mvp has always given me a correct reading ranging between 1.7 to 1.9 ohm. This morning however I'm getting a reading of 2.7 ohm on that particular atty. The others read correctly at 1.8. So is it time to change the coil, clean it, dry burn it or what?