Very slow air loss in front tire - what could be the cause?

sam2019

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My brand new 440 Scram came with 15 psi on the front tire. Of course the dealership never caught that but I did. Its supposed to be 28 psi so I pumped it up.
That was half a year ago. In the meantime my rear tire went from 34 psi to 33.5 psi.
But the front was down to 18 psi again.
Half a year is a long time so I think I can count out a hole in the casing.
The most likely reason seems a slightly defective valve. I do use a valve cap, but just a plastic one, I dont think it will keep the air in.
Has anyone heard of a micro fracture or something else that could cause this?
I will change the valve next time I see a RE workshop though, just in case.
 
Valve would be stock Shraeder? valve same as almost every tyre.
 
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