Immensely irritating drop of random playlists and internet radio stations

Have move during the autumn last year and the new setup, basically the same as earlier with some minor changes, but quite often internet radio stations are dropped after 30-90 seconds (sometimes more often) and even a random playlist suddenly ends. The LMS web interface says "null".
I usually restart the whole shabang, router, NAS and SB Touch, sometimes it helps, sometimes not...
Any ideas?