I'm getting close to three months of use with my V3 flat top now and I still get an occasional misfire. I've found this to be 100% due to B- voltage path continuity along the threaded telescopic battery tube and not the switch button or electronics. The fix is quick and any of these can work: slightly loosen or tighten the tube, wiggle the tube a little to change thread contact, clean the threads, apply Noalox to the threads. Battery cap threads and spring need to be kept clean. Battery cap should always be screwed down tight. With batteries larger than 18350 I adjust the telescopic tube so that about 1/8" of battery sticks out from the tube before I screw down the cap. Poor post contact with an atomizing device can cause intermittent misfires too. I tend to notice this after I've been using the same carto for several days.
This is also the case over hear.. I think most of the misfires this device has are attributable to a poor connection through the tube.. It's really the downfall of the device..
Mine picks this up as actual button presses and will go into the menu and change settings mine turns off frequently because of it.
Noalox helps but after awhile the noalox hardens and makes it worse after awhile. The I have to clean all the threads with alcohol. I also switch battery sizes frequently and then the noalox gets into the threading all through the tube and to get in and clean it all I end up having to use my ultrasonic cleaner on it..
It has really made me want to get a different device. I thought it was just mine, but the more I read, I see this is a defect in the design and a new one will not help..