Can't see/play AAC files - Cambridge Minx xi

[villeneuve80]

Hi !
just bought a cambridge audio minx xi DMS and trying to play my AAC library without luck. (using the streammagic app or directly on the minx xi). mp3 and other files play wells. I have the library on a synology ds213j and can play the songs with the synology ds audio app on my iphone, but on the minx xi the AAC files plays for 3-10 sec then stopped and sometimes makes the minx xi reboot...

so I've come across the minimserver site and install it to see if this can fix the issue, but aac files don't even show up in the minimserver...

any ideas ?

thanks
p.s all music is in the same folder on my nas (music)