Pair of Sonos Five now plays music from my WD Mycloud erratically

Power down all Sonos, the MyCloud and your router.

Power up the router and give it a couple minutes to stabilize. Then power up the MyCloud and give it a minute too. Last power up your Sonos gear.

Not sure that will help, as it doesn’t really address volume fluctuations. However, it certainly wouldn’t hurt, either, and is always a good ‘first step’. And, on the third hand, it might certainly resolve potential network issues, which might be being exposed by the ‘not playing’ of the various sources…but only if you reboot them while the router is off. By which I mean both the NAS and your computer . 

If it doesn’t change the situation, I would recommend that you submit a system diagnostic within 10 minutes of reproducing the issue, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Just as a side note, WD no longer supports (releases updates for) my MyCloud NAS device. You can check on their website if they still support yours. On the other hand, that wouldn’t affect volume in any way. 

​@Bright honu 

Do you have WMA files in your Music Library?

Thanks everybody. I will try all the suggestions.

And yes, all music is WMA format

Thanks mate. I’ll check the site, and also start converting my collection to lossless format

I am waiting for the next update to try it. 

One useful test before converting the whole library is to convert just two or three of the tracks that fail most often to FLAC and play those same tracks in a row. If the FLAC copies play cleanly while the WMA originals still stutter or change volume, that points to the file handling rather than your Wi-Fi or the stereo pair itself. Also make sure both Fives and the system are on the latest update mentioned above, and if possible try one Five wired to the router for a short test to rule out a weak link to the NAS. Keeping the NAS awake during playback helps too, as a drive spinning up mid-playlist can look like erratic playback. Let us know how that small test goes, because it narrows things down quickly.