Every now and then, I try libreelec on my orange pi again, since I always experienced sound drops with my avr (Yamaha htr-2067).
I'm glad I tried the stable 10.0 release, I don't have any sound problems anymore.
My orange pi one plus has now become pretty much perfect in every aspect !
I didn't apply the pass-through update, since my avr is 6-channel PCM capable, and the orange pi is decoding dolby or dts just fine.
Thank you jernej !