My LV6548 does that only in USB mode when PV energy is contributing. I now only run in SBU mode with off peak timer charging to supplement as needed.
It hasn’t happened in 9 months months however if things get weird, a shut down and restarting help. Open the grid breakers then the PV, now the two OFF switches, wait it to go off and lastly open the DC breakers. After waiting 10 minutes, reverse order but use a charging resistor before closing the DC breakers. If you are using Solar Assistant, pull the usb cables from them before de-powering and AFTER re-powering, insert the usb in the “master” inverter first. I haven’t done it in so long I had to write it down.