Yes, tested it both with wifi and ethernet. When it crashes, the music just stops. The Halo can no longer find it; says it's offline. The only solution seems to be to reboot the Core.

I stream only with Deezer or with my personal DLNA library. I don‘t use other streaming services and I never listen to radio.

I should add that I often listen to music from Deezer or Bandcamp or Apple Music by airdrop, as opposed to using the B&O app, through the Core. Makes no difference; it crashes regardless of source

Thanks for your suggestions. I do appreciate your time and input. My audio setup is very simple and I haven't owned a TV for >20 years. I have the Core, Halo, MacBook and iPhone as my music system, sourcing Deezer, DLNA, Bandcamp or Apple Music. Apart from an old 9000 multi-CD player that is independent of the ether, that's it! I don't know what else I could connect to the ethernet cable. My suspicion is that the Core might be susceptible to small power surges in the domestic electrical circuit. Nothing else connected to my router or wifi has a single problem. In fact, the only problems I ever have are with B&O devices... or their inconsistent, often crappy app!