I have a strange issue that when my main engine is running with my big alternator connected to a WS500 that randomly my MPPT chargers go offline. I have 3 MPPT chargers connected via a USB hub to a Cerbo. If I pull the USB cable and re-plug it then it all settles down again.
Until a few weeks ago it was all connected to a CCGX which had exactly the same issue. I replaced this with a Cerbo to try and resolve the issue.