E-8309 Link Access Error

Hi there,

I have 2x CDJ-3000X, a DJM-900nxs2, a RMX Ignite and an XDJ-1000mk2, which I thought I'd use as a 3rd player. When I start everything up, the XDJ doesn't connect via Pro DJ Link (even though the Utility Menu says Connected). Once I start playing on a CDJ, I can see the phase meter on the XDJ and then I can access the playlists via Pro DJ Link. However, every now and then the E-8309 Link Access Error flashes on the XDJ. Tracks play fine, phase meter works, but the RMX cannot sync with the XDJ. Every now and then, phase meters on the CDJs shudder become weird.

What I have tried: change ethernet cable, change switch, disconnect switch (unmanaged 8-port) from internet, checked XDJ ethernet port (works fine), set player number manually, verified IP addresses. There is no firewall on the network.

Any help is appreciated