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so what's the solution? And ideas?
Check your tape. Might have torn or something around the valve core. Check the torque you are applying to the lockring on the core - not too much, not too little etc.
If all that's fine you need a better sealing interface, so try:
Cut a square section out of an old inner tube. Make a small hole in the middle of it. Push the valve core through the hole so that when the core is installed in the rim it acts as an additional seal.
FWIW I don't bother with dedicated tubeless valve cores - I just cut cores out of old inner tubes meaning I can decide on the size of the rubber seal.
Howard
@bashthebox
Had my first on-road deflation yesterday - not a puncture though. Think it's the internal bit of the valve not sealing properly. Got back from holiday where the tyres were flawless, but on re-asssembling at home the rear wouldn't stay inflated. Listened very carefully for hissing, and it was coming from the valve... not the valve itself, but inside where the rubber gromit interfaces with the rim. Bunged a load more sealant in and it fixed the problem.
I think that's what happened yesterday - descended down a hill, tyre went down all of a sudden, tried to re-inflate but could only hear hissing from the valve/rim interface. Deflated a lot quicker than usual too. Stuck a tube in and got home safely.
Clearly this is gonna be a problem with this rim/valve.... so what's the solution? And ideas?