A short answer for you: When you hit TP the DNA40
REDUCES the power aka Watts. That's the way it's supposed to work

For many, myself included, this produces a less flavorful vape and less vapor production. You need to tweak your settings as already posted so you NEVER hit TP for the
duration of your draw. Also, the duration of your draw may change throughout the day.
In a dripper, which is the game changer for me, a fully saturated wick should be used to tweak your settings. Then in the same dripper, as your wick begins to dry out, TP will kick in sooner. That's the way it's supposed to work

Pretty soon you will notice a loss of flavor and vapor, and TP in a dripper will kick in sooner and so much so, you are sure to notice this. That's a good thing, and your cue to drip drip drip to properly saturate the wick.
EDIT: If you are new to NI200, then I suggest you spend the time to watch the screen on your device and see how the numbers change during a draw or even a fire and hold. This will help you understand how the DNA40 works with a given topper and your latest build.
HTH