At the moment that’s not possible I am in bed again with high fever. I think I could have gotten COVID.
Indeed stand up to switch off the Bartok is, right now, a really hard and tough job to do.
But I am isolated in the living room
So I could do things only standing on my sofa
Beside I have already tested a lot of different devices and all have the same problem.
I was a bit confused to hear that Mosaic crashed on both devices, the iPhone and the iPad. And iOS is known to be very stable. The network configuration is well installed, and works well with all devices except the Bartók.
„And finally a question for @James: is it possible for Stefano to re-install the latest Bartok firmware without using Mosaic, to make sure Bartok is okay?“ In my opinion This, it was Your idea and question, is the next thing to clarify. Stefano should take his Bartók to the dealer.
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This could be done without leaving the bed.
Go to Apple Store, search and download „dcs Bartók“, NOT mosaic
Start it, and press immediately at the wrench symbol in the right upper corner
Information —> version
Then You hopefully see this:
Compare. Do You have the same versions for front panel, control board and network board?
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wrench = chiave = Schraubenschlüssel
Wishing you a speedy recovery Stefano! 
By the way Carsten makes a good suggestion, try the legacy Bartok control app, just to see what happens.
That said, it’s still quite possible this is somehow network related, specifically your Fritz!Box and it’s WiFi that your iPhone/iPad/Android communicate through. Once you’re well enough, you may want to try to borrow/buy another WiFi access point to try out. 
Thank you guys
The Bartok app works very well.
Problem solved!
Thanks again
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Dear Stefano,
that‘s good to hear. Congratulations.
Interestingly i‘ve found some reports in other boards about people having troubles in multimedia data communication with the grey Netgears. The GS-608 has a energy saving function, and some believe that this „green function“ could cause these data communication problems.
So it may be worth a try to replace the GS-608 with a switch without green function, for example the Netgear GS-108 (the blue one), which costs about 30 €. I have the GS-105 running, works perfect.
Greetings, Carsten
Thanks. Carsten.
But wait, what does this mean? Does this mean Mosaic is now working as well? Or only that the Bartok app works?
Only the Bartók app works
Mosaic has the same problem
Do You have the newest software versions installed on the Bartók?
There are 3 units inside:
1.) front panel version, newest is 1.10
2.) control board version, newest is also 1.10
3.) network board version, newest is 504
My Bartok didn‘t work properly before installing the newest versions. And i made the same experience You actually have: The Bartók app was running, the Mosaic not properly. Since i upgraded the Bartók, both app‘s run well.
Guys, just had the same problem with my network bridge. Both iOS and android.
After a couple of hours of panic found a workaround, which hope will be useful if any one has this problem in the future.
On android it waits a couple of seconds longer before crashing, so suggest use Android for this fix:
As soon as mosaic loads, play anything. This has to be done pretty quickly before it crashes. It will play if you are quick enough.
Once something is playing mosaic reverts to its normal functions.
Thanks for your advice but frankly the fault should not be happening at all and there should be no need for a work around fix.
As always, at first sight this is likely to be a problem with your network and/or how it is configured. As of right now you seem to be the only person reporting this issue which indicates it is not universal but may be unique to you. Incidentally I use both iOS and Android Mosaic apps - no such problem.
Since the earlier issues reported in this thread from some time ago we have moved on with Mosaic versions and are now using app and network board v.1.1.3. Are you using these?
Just did a factory reset. All ok now.
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