I've got a sigelei Zmax that I'm having some short circuit issues with. This doesn't happen every time I put a battery in and I'm having trouble tiring the issue to specific batteries or whether the issue is the mod itself. About every other battery I put in (after functioning properly for about an hour) it will say short on the screen and drain the battery all the way down. Do I need new batteries or a new mod? If it's the mod can I fix it? Thanks in advance for any help! 