This is primarily a user forum and WiiM only pop in occasionally. If you want feedback from them, best to raise a ticket as I suggested above
Doing that means they can inspect your device logs for evidence of the issue.
I just did
WiiM Pro no longer bit perfect?
- Thread starter hopkins
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I just did
They better continue to be bitcorrect - This is one of the reasons people buy them ( Im one of them ) and I also dont like any sample rate conversion.
The world is full of streamers that dont sound particulary good because the digital side it less good .
Brantome
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In the interim, can you store the test files on your phone or tablet and play them from “My Music” in the WiiM Home app to see if it’s perhaps a Squeezelite/LMS issue?
So this confirms what I found?
Will check with files played from my phone as suggested above.
Balthazar B
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What happens when you play, say, a Qobuz playlist with tracks of different sample rates? Wondering if it's something related to the Squeezelite implementation or something more broad.
At least partially, but it would require a verification also in the analog domain IMO, as the recording software is out of sync with the DAC/DDC when sample rate changes and it can have some impact.
I copied the files on my phone and now none of them pass the test, even when played individually. I also tried playing them from my phone through USB Audio Player Pro (through UPNP, with bit-perfect setting), and that fails as well. In my previous tests, these two configurations were bit-perfect. I checked again using LMS, just to make sure, and same results as before - bit-perfect when played individually, but not when played sequentially from a playlist.
When I play a Qobuz playlist with songs of different sample rates the correct sample rates are displayed on the WiiM app, that's not a problem.
Balthazar B
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What is your DAC telling you when the tracks change? Does it say they're still bit-perfect or not?
My DAC does not display sample rates. As mentioned previously, it has a build-in bit-perfect test that displays a character ("P") when the test is successful. So with a Qobuz playlist I can only see the change of sample rate on the WiiM app, and it displays it correctly.
Balthazar B
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Ah, OK. Perhaps @onlyoneme has been inspired to run some more extensive testing with his RME. 
3.5 minute track sent to the DAC in a bit-perfect manner, so the issue is related only to missing samples when sample rate changes. But LMS had the same behavior as DLNA so far, so something went worse as it truncates around 0.1 sec at the end actually.
FWIW my RME is also reporting bit-perfect as normal, stepping through the various sample rates (44.1, 48, 96, 192). The files are being fed by DLNA from a BubbleUPnP server.
(It did pop the emphasis warning on one occasion, but that was a glitch at track/SR changeover.)
(It did pop the emphasis warning on one occasion, but that was a glitch at track/SR changeover.)
That sounds like a very plausible explanation, and somewhat reassuring. But it would be good if they could fix this, and "guarantee" what they advertise.
Confirmed also with UCX II and the Flex.
And on the analog output, these samples at the end are missing.
Balthazar B
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Difference between transport protocols? Or caching?
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