@vova I thought the problem was solved, things had been stable and Roon was running very well, but today the issue returned. Moving everything around to hardwire things together will be a bit of a challenge, but I guess that’s the next phase to move on to.
Without any reason Roon has a problem with its database. You can see the number of albums is counting down.
Nothing has changed in the setup.
I work with a qnap TS-879pro with 8x 3TB drives.
smb://AV001/FLAC and smb://AV001/ISO
These are my links to the music files.
Does this errors occurs more often with other users. It is really annoying.
I’ve been having this issue for weeks. Some times very frequently (every few days), more often sporadically at semi-weekly intervals (7-10 days). It is irritating. Tech support and the community have tried to help me identify the issue in another thread, but every time I think it’s solved it crops back up. While I haven’t identified the root cuase, I have found a few triggers. If you are editing meta data with a 3rd part tool such as Mp3tag and Roon starts scanning your drive while you are making changes, it will cause this behavior. I have learned to shut down roon while making meta data changes. Also, certain system temp files seem to cause issues. I use Bliss album art manager and it stores a backup of the cover image when making an update. Example is folder_48373.jpg. When roon hits one of these directories, then it seems to trigger this behavior. I had the same issue with a few rougue ._appledouble files that have since been removed. None of these have totally eliminated the issue, but seem to have helped some.
Hello John,
Thanks for your reply. It seems Roon can not help us to solve this problem.
I do not use a 3rd party tool like Bliss, but I use an iMac as my core.
Hello guys, thanks for the report and apologize for inconveniences. We are still working on this issue in attempt to find reliable reproduction steps.
We were able to reproduce this issue several times in our QA environment but with unrealistic circumstances - 99% loss of network data. This is apparently not your case, because even with loss of albums you are still able to interact with the Roon Core using the Remote app.
At this point I would like to ask you several questions, which can help us in the investigation:
@Arno_Veldhoven would you mind to tell us more about your setup ?
@John_Hunt, did you have a chance to try a direct wired connection between your NAS and machine were Roon core is installed ?
Thanks in advance.
My setup is as following:
I play with a Meridian MC200 - iMac - QNap TS879 pro. As a remote I use an iPad pro.
My Amp is a Devialet 250, and my speakers are Revel Ultimate Salon2.
My network is with cables, I use Audioquest network cables. I have about 7000 albums in Flac and DSD in the library.
You can understand why I am so annoyed when my database will count down everytime.
Would you mind to describe your network setup in details?
How often is it happening ? Can you reproduce this at will?
My network setup is really simple, my qnap has a shared drive called FLAC and ISO.
In Roon I have setup two connects:
smb://AV001/FLAC and smb://AV001/ISO
It is connected over ethernet, through DHCP and a manual IP adres, my iMac has 192.168.19, my router has 192.168.1.253, over subnet 255.255.255.0
@vova, yep I hardwired as instructed. Issue continued to crop up. Hope you are able to quash this bug. It is really extremely irritating. Roon is once again re adding the library after counting down to zero as I write this reply.
Any news on this problem ???
@vova, seconding Arno on this. Literally watching Roon reimport my collection again as I type this. I’m really not sure what else to do. I’m about at my wits end with this issue. It really does render an amazing product basically useless, as i never know from one use to the next when my collection will be there and when it won’t. With 10,000 albums the reindex process is slow at best. I keep hoping each release will have fixed it, but no dice. I’m really hoping you have something up your sleeves.
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I’m seeing this happen today 
I have 94k+ files stored on a directly-attached Firewire drive. I noticed earlier today that tracks were “disappearing” from the database (couldn’t find them via search or anything). Took a look at the storage tab and instead of 94k+ tracks, only 40k (or so) were showing!
I removed the folder from the configuration altogether, figuring something had gotten corrupted and I’d let it rescan. It “sees” all 94k+ files, but now won’t add any of them to the library! Watching it count down smaller and smaller numbers of tracks, adding none to the library 
So what’s going on!?
To my surprise the database seems to be stabile now. An error didn’t occur anymore. The only thing I changed was setting in my network.
Hopefully it stays this way.
Which setting in your network?
I changed smb://AV001._smb._tcp.local/FLAC to smb://AV001/FLAC
After that the problem didn’t happen anymore.
How does your link from roon to the nas looks like ??
A post was merged into an existing topic: Roon on macOS (OS X) not working with large library (70k albums)
This behavior continues to plauge me. I’ve seen others continue to mention the same problem. Has anybody found an actual solution? I’ve tried everything suggested to date? Thanks for any additional help or suggestions.