Uncle
Sounds to me like you could be in the 'semi-plugged' category which can happen after time. Not sure how clean you keep your stem screens but unless cleaned often, they will slowly plug up and take Zapping into a "not so efficient" range. Our log vape also has a screen in the heatport to keep junk from falling down into the lower part of the heatport and that screen can get slightly plugged over time.
Start by blowing out the Zap with comressed air. The more PSI out the air squirter, the better. Do this OUTSIDE or in the garage, etc as lots of small particles can accumulate in the heatport area over time. Blow in and around the heatport, through the center hole and the 6 small holes. Now take a look at the screen in the heatport to see if it is plugged in any way. If it is, use a long pin or something similar to open all the screen 'pores' to original, then blow out again. Put a new screen in your stem. Try that and report back.
The transformer wire right next to the plug could also have an effect as it is a stranded wire and will break slowly. As the connecting strands break, the wire loses it's ability to carry the small amperage needed to properly heat the Zap. Thanks for that help kewpcer. Our plug kit, aka transformer repair kit, will fix that problem.
We call the center hot area the heatport and always have. It is the port where the heat is so we call it the heatport. I can understand others, not me of course, feeling good about calling the center hot area 'the female part' for one reason or another.
Edit for:
Saturday, 4/30. This is why I like to keep caught up.
Several orders received Tuesday the 26th are shipping today for an expected Monday arrival. That will even beat one week from order to delivery. Orders made on the 27th/28th should ship Monday or Tuesday for a mid-week arrival.