Anyone from Roon support able to help here please?
Have you set Arc to download on WIFI only?
Hi @Graham_Ridgway,
Thanks for your reports and continued patience. From a recent Arc diagnostic report, it seems that Arc is stuck in a state of attempting to sync tracks that are seemly corrupt.
If you head into your normal Roon Settings>Library>Skipped files, do you see any skipped / corrupt files?
With that, are you using any DSP during playback?
@benjamin thanks again for helping here. I have looked in Roon and and there are no skipped files listed. However I was having the problem of trying to play an album (from ARC) and when looking at the track listing they were each marked as “unavailable” in red. I think that might be happening to albums in my own collection (I have my own set of FLACS plus qobuz). When ARC is connected on my wireless at home, it doesn’t have that same problem.
And no DSP used (as far as I can tell), where would I check this please?
@Jim_F No I haven’t set ARC to download on WIFI only. Do you think it may have been trying to download? It’s not functionality I have often used (probably only once to try it out).
Thanks again everyone!
Hi @Graham_Ridgway,
Thanks for the follow up!
After chatting with our development team more, we believe you could have DB corruption on your current Arc installation. As a next step, could you please fully remove Arc on your device? I understand this is unfortunate as you’ll lose your current downloads.
With concern to bandwidth usage, we suggest selecting a more restrictive playback quality under your Arc settings.
Let me know if you encounter the same issue on a fresh installation of Arc. Thank you! 
Thanks @benjamin. I’ve done exactly that and also acquired a fresh load of mobile data so will be checking it out over the next few days. Working ok so far today.
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Here’s a quick update which may give the answer. There’s a bit of guesswork here. I have two sources - Qobuz and my own collection of ripped CDs into FLACS. Generally if I select an album to play I #think that Roon generally tries for the local file version then goes to Qobuz.
As I was having more issues, I had another long look and play. What I discovered was that Roon and Roon ARC worked ok on my wifi, but ARC had issues with certain albums on mobile data.
I finally tracked down the problem that my (file) server IP address had changed. Somehow both Roon and ARC coped on my wifi, but ARC didn’t cope on mobile data and got into a major retry pickle. On one album that I was using to test ARC would play the first two tracks and no further. I’ve no idea why, perhaps the first two were buffered somewhere somehow.
So two conclusions - one get your server IP address right and don’t allow it to change. The second is that ARC might have slightly better error handling in this case when it is running on wifi in the home network rather than on mobile data.
I will monitor and am away again this weekend so can do a proper test. I’ll report back the final conclusions.
Cheers all
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Hi @Graham_Ridgway,
Can you please clarify the network topology in play here? Specifically, what equipment is involved in connecting the ROCK to the internet?
Do you see any changes in behavior on the most recent build, released today? Please try updating your RoonServer and ARC.
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