I noticed a drop in humidity despite not having changed anything in my setup. I ran into this one before, last summer. After running a bit, the hose running to the tent will become weighted down and collect water, clogging the humidity stream to the tent. If I lift up the hose, water drips out. The solution for now is I made the hose as tight and straight to the tent as I could, if that don’t work, I used to prop up the hose with metal hanger into a rainbow arc. We’ll see how it goes.