Playback was interrupted because a track failed to load

I restarted roon server via systemctl and it works now … weird… i found one more thing in log…

01/11 13:04:48 Warn: [rnet/RnetJsonClient] failed to connect Connection refused
01/11 13:04:48 Trace: [raatserver] [RaatServer x-iPad @ 10.0.1.47:50006] client connection failed. Retrying in 500ms
01/11 13:04:49 Trace: [raatserver] [RaatServer x-iPad @ 10.0.1.47:50006] connecting (attempt 2)
01/11 13:04:49 Warn: [rnet/RnetJsonClient] failed to connect Connection refused
01/11 13:04:49 Trace: [raatserver] [RaatServer x-iPad @ 10.0.1.47:50006] client connection failed. Retrying in 750ms
01/11 13:04:50 Trace: [raatserver] [RaatServer x-iPad @ 10.0.1.47:50006] connecting (attempt 3)

Is it possible its connected with Android Roon Remote looses connection to Core (daily) ?

Do I have to add these rules on box where Roon Core is running or on router?
Thanks!