After I removed all mounts and created a new folder on the synology dedicated to the VU and monuted this folder as "HDD replacement" = yes, then I do not have any crash. I just have the problem with "Disc full" error. So apparently something is preventing the VU to write to the disc, but I have no clue what it is. There is plenty of space on the drive and there is no limitations set. both CIFS and NFS share service is enabled on the synology and persmissions looke all correct. I can write to the folder from other devices. So I don't understand why the VU gives me the disc full error. Any ideas?