mick37.. I know it is frustrating not having something that you purchased work the way you
expect it to.. I do know that the AFSv2 is a complex
device (states in both suppliers site as well) .. and by complex I mean by design.. not use .. there are alot of parts involved that screw together and o-rings as well... I know that devices like this need to be handled with care ( not saying that you are not doing so)
Now with out seeing your AFS in use and the problem first hand it can be left to many assumptions .. that sadly even with all of the advice in the world ..it's up to the user to come to a determined solution... now with that being said.. I will share with you my experiences and observations with my
device, because as a consumer myself information is the key to success.. (cliche I know but still

)
This is assuming that all o-rings are in good condition and everything is assembled properly.... (you will know that you have proper seal if you have everything closed (cr included) and when taking a drag you feel the almost complete resistance)
The only place and time I had leaks occur is when I had the draw too "tight" and flooded the atty(the CR adjusted up too far) this would cause the fluid when I sat it down to go out the vent holes of the AFS in turn majority of it escaping out the holes the CR covers. This may be noticed at a later time when you open the CR again for another session...
if this happens you will experience leaking until that excess fluid is out.
What I found to work for me.. when I happen to flood the atty abit (hearing gurgling), prior to my vape session is complete, I open the CR allowing easy draw and finish off my vape when the gurgling stops or right before the atty seems to need more fluid (decrease in vape production) this way it will deplete the excess fluid inside the atty itself... in turn eliminating (or minimizing) the liquid from settling and prevent any leakage out the airway path at the bottom of the atty and
device ( the path is not the vent hole of the atty, but the center hole going out the connection of the atty)
This is just a theory since when I did get leaks I can only see it come out of the holes under the CR.. ( and opening and closing the CR with liquid leaking.. it will push it in various locations of the device's exterior)
If you have ever used 901's ,normally on a device, you will see the same effect when the atty floods, but with the vent hole exposed you will get most leakage out of there... since it would be
the path of least resistance BUT if you flood it alot you will still see a slight pooling in the connector when you take the atty off....
So with the AFS since the 901's side vent hole inclosed in the tank.. that will leave only one path of least resistance for the excess liquid to pool out of.
One good thing is .. if the 901 atty isn't flooded.. it should not leak out when not in use and the CR fully closed... or even set upright with the CR open
I really wish you the best in solving your situation.. because as for me, a consumer, and vaper of many devices(for almost a year so far) IMO the AFSv2 is a pleasant device to utilize....
again I apologize for any redundant comments
Sorry(reread, but this will also go for modded cartos as well, but it takes more to flood a carto.. to get it to go over the inner post to go out the connector opening... and carto flooding is caused by too tight of a draw as well... or the modded hole not far enough away from the oring that goes over the carto
LGD