VRM with Raymarine axiom

I appear to have a new problem on hardware which has worked previously for a few years. My Cerbo GX is hardwired to the Axiom mfd via a network switch in order to get data onto the VictronConnect app on the MFD and connects wirelessly to my 4G router to get the VRM functionality. I noticed today that after turning the Axiom on the live data stopped being sent to VRM from the Cerbo. If I disconnect the lan cable to the mfd VRM starts getting data. Reconnect it and it stops. Any ideas? I don’t think this can be a Raymarine issue but I’m open to suggestions at this point. It did get a software update a while ago but surely it doesn’t tell the Cerbo to stop sending data over Wi-Fi to my 4G router? I’ve rebooted everything. Cerbo is on latest firmware available. It used to work seamlessly.