S50 pro+ problem when playing music files from USB stick

Hi there,…

I have three S50 Pro+ for multi-room system.
All of them have the same problem.
When playing music files from USB stick, there are always have intermittent skip or jump between two music files played.
Some times there are cracking noise too !

Very dissapointing, as S50 Pro+ is one of Arylic flagship product

Did anyone have the same problem and know how to fix it ?

Thank you

Firmware version 4.6.415145.35

oops, sorry !
I already found a thread where this is discussed.