[PROBLEM] System freezes after a while

[rph-r]

Just to hopefully clarify what the issue you report is.  Does the post quoted above tell us that you get no freezes until you mount a network drive that is actually located on another RPi?

Exactly!
It is a very basic Samba network.
-on Moode: I select it in the library settings (create -> type: SMB)
-on the RPi server:

Code:

fstab:
UUID=EB07-72BC /home/pi/Music   vfat    defaults,noatime,nofail,uid=pi,utf8,x-systemd.device-timeout=1          0       0

Code:

smb.conf:

[global]
dos charset = CP850
unix charset = UTF-8

...

[musique]
  comment= DD Musique
  path= /home/pi/Music
  valid users = @users
  force group = users
  create mask = 0660
  directory mask = 0771
  read only = no