Hi all im'e having a problem with my mask ( speedglas 9000) when you strike the arc it goes dark but after a few seconds it cleares ,Then when you switch it off and then on again it stays dark if you arc up it cleares then goes dark then just flickers light and dark the batteries are about 3 months old and its been used for about 12 hours it total ?,,anybody got any idears or can you get them serviced?,,,,,,john