Need some help I recently started hearing a hissing/static sound coming from my mod I know it's the mod I took my tank off the mod is a kooper plus 200w the tank is a tfv4 early in the day I swapped out an clean the tank swapped from a 3 coil atomizer to a quad coil atomizer running it the same way just a little more watts 425° 85w (.14 ohms with new coil) when it's locked or even in sleep mode it hisses or a static sound when I power it off nothing I tool the 2 Sony vtc batteries out not even warm an there not hissing what could it be just started 30 mins ago we ther it's bien fired or not when locked an I hit the fire button it stops then I release the button an immediately it comes back either it will change in pitch or sound like static then 5 to 10 secs later it's constant again what could it be???