Hello guys, I've got something bugs me all the time which is arcing mark. I am using .22 ohm build on a single 18650 mech mod with Sony VTC4 and Samsung 25r, so I think it is pretty much safe. From some point, I realised that some arcing is happening between the negative side and the button. I am googling it here and there but there is no clear point about this. It would be grateful if somebody can explain why it happens, how to prevent and how to maintain or fix. Thanks