stem leaks on Ridenow TPU inner tubes

[srshultz]

I’ve recently purchased several Ridenow TPU tubes. The ride is fine but they leak down 7 to 10 psi per day. Both front and rear tubes. After several water tests I found that they were both leaking past the presta valve along the inside of the plastic stem. To be clear, the valve is not leaking. The air is passing between the valve and the plastic stem.
I treated my third tube by applying a small bead of super glue where the body of the valve and the opening of the stem. No problem with the third tube.
Anyone else with this problem?

 

[DCLane]

I've similarly had an issue with Wiggle/ChainReaction's Lifeline tubes. When they get wet in heavy rain the glue on the valve detaches with an instantaneous deflation.

 

[srshultz]

I’ve tried another brand, Heasygo, and so far so good. Made of tougher material and no leaks in several days.