Minim stream being throttled on QNAP NAS ?

[simoncn]

Frrom everything you have said it sounds like the problem is on the Sonos side of things rather than the QNAP/MinimServer side of things.

The difference between 128k and 256k MP3 files is not significant with regard to this issue.

You need to set .logLevel to debug on the MinimServer configuration web page to create a debug log. To ensure the log file doesn't contain unnecessary output, do the following:

1) Start MinimServer with the default logging level (info)
2) Before playing the test tracks, set the logging level to debug
3) As soon as you get a couple of failures, set the logging level back to info and make a copy of the minimserver.log file
4) Zip/compress this copy and post it here

I think the log will show that the Sonos renderer is closing the connection before streaming of the track is complete and possibly retrying streaming the track a few times. It would be good to have definite confirmation that this is happening.