Bartok sometime is not responding (hang up)

Alex there are several reports of similar occurrences. For example:

In most cases the problem lies not with the Bartok but with the network especially the router or the router configuration. I am no network expert but if you use the search facility here and just enter “Bartok Hang” you should find lots of examples and suggested remedies.However I am unsure about this in respect of a total freeze of the Bartok where no commands work even from the fascia buttons.

One thing that may help in the future will be v.1.1.1 of Mosaic ( apparently to appear “shortly” but we have been awaiting it for quite a time so far). This will have an improved “discover” function which will improve connectivity. However I do not know how that will affect things if you are using Roon, about which I am pretty ignorant, but I assume that you use Roon remote for control?