I just bought a Vision Spinner 2 and I'm not sure if it is working properley. When i press the manual button the light comes of fine but it seems the coil does not start heating up for 2-3 seconds? i volt it manly on 3.8 and use it on Kanger Protank 3 mini and a Vigor Duel coil tank and seems to happen on both but the Kanger seems to start heating the coil in the 1.5-2. second range is this normal? if not is there a way to fix it?