So in my travels I purchased an authentic DNA40 Hana Modz. I've had it for a whopping 2 months and 3 weeks ago it started acting up. When you hit the fire button repeatedly to lock it it says, "right mode", the LCD will not turn off, it's stuck in temperature control mode at 40 watts and you cannot change it. Being that the Vape shop I purchased it from is several states away I called Hana directly. In fact I have called them 6 times over the last 3 weeks and all I ever get is a recording to leave a message which I have done with an explicit description of the problem, date of purchase and a phone number to call me back at. These sorry bastards have yet to return my call! So much for a 'US' company. I finally called the Vape shop and they said they'd be more than happy to send it back for me as they are a direct distributor. They said it sounds like the chip...yeah. So I sent it to them this past week so they can then send it to Hana and I estimate I won't see it again til October. If you are thinking about a Hana purchase you'd be wise to buy local or consider another manufacturer considering the price.