The ego one has short circuit protection. I personally think it might be a contact issue. Take a earbud put some surgical alcohol on and clean the connector as well as the connection pint on your tank.
I think we should do our best to keep the public perception of vaping as good as possible, thus I only vape in designated smoking areas. I still fear that on one fine day someone is unknowingly going to blow a big cloud in the direction of a health MEC or a minister and that will be the start of...
I think the negativity is a bit harsh. I know a lot of smokers that will never become vapers. Hopefully this might be something that they would consider.