Almost certainly a connection issue, could be the way the mesh is connected in the atty and you may not be able to change the. After vaping TC since the DNA 40 I had to use ohm lock for the second time, both times were with clone atties, the first was an Origenny 2 ( managed to fix that by stripping some of the anodising) and now with an Exocet (for Billet Box). It feels a bit like defeat doing it, but it works tuning by taste. In Atomiser Analyser override ohms to the lowest it registers in Device Monitor, set the temp to your norm, if to weak increase the res a little, if to lively lower the res a little, repeat until it hits the sweet spot.
Only do this if you have to, DNAs do a great job with good connections and like I said I have only had to do it twice since TC hit the world. Some gnarly coils may benefit even with good connections they can jump about in res terms.