Playback stops when DirectPlay, then start transcoding

[Bekkk]

Ok I did more check :
- It appears Oppenheimer is not working on any devices at all. It stops randomly while playing (external or local network)
- I tried to change the volume in JF docker from my mergerfs pool to the disk directly, and things seem much better now.

More details on mergerfs :
I created a partition /mnt/toshiba4TB for my disk, and a partition /mnt/pool for mergerfs. While having the problem, JF was reading on /mnt/pool
I changed the volume I am using in docker-compose from /mnt/pool to /mnt/toshiba4TB (meaning now JF is directly looking onto the disk instead of using mergerfs), and it doesn't give me any trouble.

Seems like mergerfs could be the reason of it. Do you guys have any idea why ?
Here is my fstab :

/mnt/toshiba4TB /mnt/pool fuse.mergerfs cache.files=off,dropcacheonclose=true,category.create=mfs 0 2