I've been using a 4071 for over a month now and I love it, however about 2 days ago, I started having trouble getting it to work. I swapped batteries and atomizers like crazy before I finally found what I think is the problem. There seems to be a leak where the mouthpiece meets the atomizer. If I put scotch tape around the area where they meet, the problem is solved (so far). Oddly enough, this seems to have happened all at once with all 3 atomizers I own. Unfortunately, this could make refilling a major pain as I would have to un-tape and re-tape each time - especially since I drip. Any suggestions? Has anyone else had this problem?