Top box mini volts not staying constant

[champions]

I have a Kanger Top Box mini. The volts don't stay constant when I hit the fire button in power mode.

I just noticed this today. It's very dramatic when my Mage RTA is on it. Mage has a .35 build. At 41 watts I'll get 4.28, 3.76, 3.65.....

Is this normal with this mod?

I get the same issue with my kayfun 5, but not as dramatic.

When I put these attys on the istick 100 or rx2/3 I don't see this behavior..

Thanks

 

[thijs]

i bit late but i had this problem too

with a good cleaning of the center pin and pushing it a bit back towards the battery it worked great again