Picture the situation, if you will: You've got an Ithaka V2 that you've been using without issue on a GGTS since the first batch when it was launched. Both devices are clean and there is nothing wrong with any of the parts. You build the same 1.1 ohm 8 wrap micro coil (26ga Kanthal) that you wick with strips of organic cotton from Muji pads but suddenly it no longer wicks. At best you can use the device for 20 minutes before you start getting less vapor, the device doesn't sound right (it's more or less silent, no rumble like I usually get when I'm taking a drag) and you get a dry sounding hiss when you let go of the button and take it away from your lips. You rebuild and rebuild and rewick and rewick (sometimes with thicker wicks, sometimes with thinner ones) using the same spool of wire, bag of cotton pads, and brand of juice that you've been using for the past year but this is all it does now. You know there is no short because the coil glows as it should, the multimeter reading is stable and as expected, and the atomizer will even work on a ProVari V2 with no errors. Desperate you change the o-rings in the atomizer and GGTS but everything is the same. Why does the device no longer wick like it used to? Does cotton not wick as good over time or something? It's been like this for months with the exception of last week when I rebuilt and wicked like I would normally and it worked perfectly like it used to, but today I needed to change the wick and have done this about 4 times so far because it is right back to not wicking right. Even when I build with a wick that is so thin that you'd think it would just instantly flood it does this. Adjusting the juice flow or the air control doesn't make any difference.