Synology

[simoncn]

These figures for CPU and RAM are fine.

Because the problem is occurring at the start or end of a file, it could be related to network latency (not speed or throughput) and how the Aries handles gapless playback. Gapless playback requires network messages to be exchanged between the player and server at the end and start of a track and the timing of these messages can be critical. Wireless networks have more latency than wired networks, so the extra latency of wi-fi combined with the slower processor in the DS118j could be causing this problem.