buzzing

I bought a mod off of the forum fairly recently. It was 3 months old but immaculate and hardly used. It's still pretty great condition but can't be more than 6 months old. Today I leaned against the mod and noticed a light buzzing sound. It's only present when the mods screen is lit. Has...

While firing at a respectable 12.5W the SVD mod suddenly started buzzing low down on the battery compartment, I caught quite the spook seeing as Im using an efest 18650 purple batt, what with the latest efest batt scandal and all. Probably the fastest batt change ever, but the batt wasnt even...