i am with
@Bass Vaper on the fact that it is more with clicking the on/off and twisting the dial, that with time the backend can get broken, i had that problem with my first backend and i am 90% sure it was from mechanical usure, because i never used the original charging cable, i use an external charger from the beginning on, in the time my backend broke apart, also the hopper body began to turn strange (lightshows happening and burnt herbs/nonstop heating) and, like i said, i never used the original charging cable...
i am not saying that there is no possible relation between hopper problems and charging cable, but i can not report about it,,,
by the way, my hopper now works as it should and i am able to get about 4-5 bowls of around 0,1gr per bowl, out of one batteryload, i did not test all of my 7 batterys already, but the three i'm using now are all about the same charge when in use,,,mostly i start on 3,5-4 for some draws and then i go up to 4,5-5 for the rest, the drawing sensor seems to work fine, because i have the feeling i make a lot of draws (more then 18 seconds), and then i click it off, rarely it shuts down by itself,( only if i just draw very soflty and only do one or two draws then it shuts of after 18 secs, but i only did this for testing), usely i draw slowly with a litlle force and wait about 3-5 secs between each draw and then it works like i previously described,,,(hope it makes any sense:-))
anyway, i love my hopper,,,:-)