I have owned my SS GGTS a month or so now and for some reason I can only get it to fire at 3.7v.My batteries to vape at 6.4 and 7.2.I have several backups and were working fine up till today and 2 sets of aw LifePO4 3.2v 500mah are pretty much brand new.I tried to clean it,use different attys and cartos but it just wont fire up.Well almost,it will fire up for a fraction of a second then cut out.Greatly appreciated if someone could help me out.