No grid meter VRM Warning using VM3P75CT

About the system:
Multiplus II
MPPT RS
Raspberry Pi running Venus OS
VM3P75CT running as a grid meter connected via ethernet

I have had the ‘No grid meter: Warning’ 3 times in the last 2 months. I cannot pinpoint any anomalies that could easily explain it away. The warnings lasted: -1m (yes, negative), 15s and 7s. The first two occurred in quick succession about a minute apart and the last one a month later. Has anyone experienced this behaviour?