My husband has a Smok Vmax that seems to have just stopped working correctly. It seems like it doesn't recognize when an atty/tank is attached? Batteries and attys/tanks have been checked and re-checked on different devices and they are working fine. It tells him the battery charge accurately, but when he puts the tank on it doesn't work. He always uses Mini Nivi Nova tanks and this is the first issue he has had since we bought it in October. Is anyone familiar with these enough to help us troubleshoot what the problem may be? Any help is appreciated because we know nothing about this device other than he loves it and we can't afford to have to buy a new one! 
