I have that problem but on my 20 watt, and only after 3 months, I'm guessing because the 20 watt has a fixed connection. Its really annoying because I bought it right before the 30 watt came out. Problem has somewhat subsided as I now just use one tank on it (subtank nano with 1.2 ohm coil), but it still sucks. At home I threw my 5 ml Nautlius on a spinner which looks ridiculous but gets the job done if I want to change flavors. Can't decide if I wanna trust Eleaf and get a 30 watt iStick or go with an MVP 3.0 (much bigger, portability is key for me) or a Cloupor mini, or Segeli, etc. I really want to see how these devices hold up after a few months because I feel like all the reviews on youtube are right out of the box and I want a device to last me a minimum of a year without problems. Not 3 months like the iStick 20 watt. Feel free if you have suggestions, it seems they really made the 30 watt better so I'd like to know if anyone else had problems before I decide.