Similar issue here. Using latest firmware according to their ios app.
I have reset the earbuds several times, after pairing i press volume down on left earbud, and it lights up yellow in the ios app.
Right earbud works fine, and i can adjust volume with left earbud, but no audio in left earbud
After doing some more testing I find that sometimes audio fades in when I press it firmly into my ear, but when I then even think about touching it later the audio disappears. I think the left earbud must be faulty.